YouTube is an American online video-sharing and social media platform headquartered in San Bruno, California, founded in February 2005 by Steve Chen, Chad Hurley, and Jawed Karim. It was acquired by Google in November 2006 for $1.65 billion. The platform allows users to upload, view, rate, share, add to playlists, report, comment on videos, and subscribe to other users. It offers a wide variety of user-generated and corporate media content, including video clips, music videos, educational tutorials, live streams, and vlogs. YouTube has become a central hub for digital media consumption and has influenced internet culture, entertainment, and education globally.

1 History

1.1 Founding and early years (2005–2006)

YouTube was created by three former PayPal employees: Steve Chen, Chad Hurley, and Jawed Karim. The domain name "youtube.com" was activated on February 14, 2005, and the first video, *Me at the zoo*, was uploaded on April 23, 2005, by Karim. The platform was originally conceived as a video-dating site but quickly pivoted to general video sharing after users began uploading a wide variety of clips. Early content featured home videos, comedy sketches, and amateur music performances. By mid-2006, YouTube was hosting over 65,000 new uploads per day and drawing 100 million daily video views.

1.2 Acquisition by Google (2006)

In October 2006, Google announced its acquisition of YouTube for $1.65 billion in stock. The deal closed in November 2006. Google integrated YouTube with its existing advertising and search technologies, while allowing the platform to operate largely independently. The acquisition positioned YouTube to become the dominant online video service, outpacing competitors such as Google Video and Yahoo! Video.

1.3 Growth and expansion (2007–2012)

Between 2007 and 2012, YouTube experienced rapid growth. In 2007, the platform launched its Partner Program, enabling creators to earn money from advertisements. The "Life in a Day" crowdsourced documentary project in 2011 exemplified the platform's collaborative potential. By 2012, YouTube was streaming over 4 billion video views per day and had launched localized versions in more than 50 countries. The introduction of live streaming in 2011 and 1080p HD video in 2009 expanded the platform's capabilities.

1.4 The rise of professional content and YouTube Red (2013–2019)

The mid-2010s saw a shift toward higher-production-value content. YouTube launched the "YouTube Spaces" production facilities in 2012 and 2013 to support creators. In 2015, the platform introduced YouTube Red (later renamed YouTube Premium), a subscription service offering ad-free viewing, background playback, and original series. The rise of multi-channel networks (MCNs) helped professionalize creator management. By 2019, YouTube was reportedly paying over $1 billion to creators annually through the Partner Program.

1.5 Recent developments (2020–present)

From 2020 onward, YouTube expanded Shorts, a short-form video feature launched in beta in September 2020, to compete with TikTok. The platform also introduced Super Chat, Super Stickers, and channel memberships for non-gaming creators. Policy changes regarding hate speech, misinformation, and copyright were updated regularly. In 2022, YouTube announced that Shorts had surpassed 50 billion daily views. The platform continued to invest in live streaming, including integration with YouTube Gaming and the acquisition of video game streaming services.

2 Platform features

2.1 Video uploading and hosting

Users can upload videos to YouTube through the website, mobile apps, or third-party tools. Uploaded videos are processed and stored on YouTube's servers. The platform supports a wide range of file formats and resolutions, from 240p to 8K, with automatic encoding for adaptive bitrate streaming.

2.1.1 Supported formats and quality

YouTube accepts common video formats such as MP4, AVI, MOV, and FLV, with H.264 and VP9 as the primary codecs. The default quality is MP4 with H.264. Higher resolutions, including 4K and 8K, require appropriate encoding. YouTube also supports 360-degree and VR videos, as well as HDR (High Dynamic Range) content.

2.2 User interaction

2.2.1 Comments, likes, and shares

Each video has a comment section where users can post text replies. Viewers can "like" (thumbs up) or "dislike" (thumbs down) videos, though public dislike counts were hidden in 2021. Videos can be shared via direct link, embedded code, or social media platforms. Users can also report videos for policy violations.

2.2.2 Subscriptions and notifications

Users can subscribe to channels to receive updates. When enabled, the notification bell icon alerts subscribers to new uploads, premieres, and live streams. Notifications can be delivered via email, mobile push, or the YouTube app.

2.3 Search and discovery

2.3.1 YouTube Search algorithm

The search algorithm ranks videos based on relevance, engagement (watch time, clicks), and user history. It analyzes video titles, descriptions, tags, and captions. YouTube's search engine is the second-largest search engine after Google itself.

The recommendation system suggests videos based on user viewing habits, often appearing on the homepage. The Trending tab surfaces popular videos in a given region, updated daily. The system has been criticized for creating filter bubbles and promoting controversial content.

2.4 Playlists and channels

Playlists allow users to organize videos into sequential or themed collections. Channels serve as a creator's hub, displaying uploaded videos, playlists, about information, and community tabs. Channels can be customized with banners and trailers.

2.5 Live streaming and Premieres

YouTube supports live streaming for verified channels with no subscriber minimum. Viewers can interact via live chat and Super Chat. Premieres allow scheduled video releases with a live chat before, during, and after the premiere, creating a communal viewing experience.

2.6 YouTube Studio and analytics

YouTube Studio is a dashboard for creators to manage videos, monitor comments, and view analytics. Key metrics include views, watch time, subscriber count, revenue, and audience demographics. Creators can also access copyright management and monetization settings.

3 Content and community

3.1 Categories of content

3.1.1 Music and entertainment

Music videos, live performances, and user-generated covers dominate the entertainment category. Record labels and artists upload official content, while fan-made compilations and remixes are common. YouTube is a primary platform for discovering new music.

3.1.2 Education and how-to

Educational content ranges from academic lectures (e.g., MIT OpenCourseWare) to practical tutorials (e.g., cooking, DIY repairs). The platform is a major resource for self-directed learning.

3.1.3 Gaming and esports

Let's Play videos, walkthroughs, and esports tournaments are widely shared. Popular games include *Minecraft*, *Fortnite*, and *Among Us*. YouTube Gaming was a dedicated app until its features were merged into the main platform.

3.1.4 Vlogs and personal channels

Vlogs—video blogs—document daily life, travel, and personal stories. Personal channels often build intimate communities around a creator's personality.

3.2 YouTube creators and influencers

3.2.1 Notable early creators

Early pioneers include "lonelygirl15" (a fictional vlog), "Smosh" (sketch comedy), and "The Annoying Orange" (animated parodies). These creators demonstrated the potential for viral fame and monetization.

3.2.2 The Partner Program and monetization

Launched in 2007, the YouTube Partner Program allows creators to earn revenue from ads on their videos. Eligibility requires 1,000 subscribers and 4,000 watch hours in the past year. Creators share ad revenue with YouTube (typically 55% for the creator).

3.3 Internet phenomena and memes

3.3.1 Viral videos

Viral videos spread rapidly through sharing. Examples include "Charlie Bit My Finger" (2007), "Gangnam Style" (2012), and "Baby Shark Dance" (2016). Such videos often accumulate billions of views.

User-generated challenges, such as the Ice Bucket Challenge (2014) and the Bottle Cap Challenge (2019), often originate on YouTube. Trends like "Unboxing" and "ASMR" have sustained popularity.

3.3.3 Memes originating from YouTube

Many internet memes originate from YouTube videos, such as "Nyan Cat," "Rickrolling," and "I'm Something of a Scientist Myself." Reaction videos and remixes further propagate these memes.

3.4 YouTube culture and slang

3.4.1 "Like and subscribe"

A common call-to-action, urging viewers to like the video and subscribe to the channel. This phrase is often parodied or used ironically.

3.4.2 "Don't forget to hit that bell"

Refers to the notification bell icon. Creators encourage viewers to enable notifications to receive alerts for new uploads.

3.4.3 Sub-groups (e.g., commentary, reaction)

YouTube hosts sub-communities such as commentary channels (analyzing internet trends), reaction channels (watching and responding to other media), and drama channels (covering controversies). These niches have distinct slang and norms.

4 Business and monetization

4.1 Advertising model

4.1.1 Pre-roll and mid-roll ads

Advertisements play before (pre-roll), during (mid-roll), or after (post-roll) videos. Skippable ads can be skipped after five seconds, while non-skippable ads must be watched. Bumper ads are short, six-second non-skippable spots.

4.1.2 AdSense and revenue sharing

Google AdSense serves ads on YouTube videos. Creators earn a share of the revenue, typically 55% of the ad earnings. YouTube retains the remaining 45% for platform costs.

4.2 YouTube Premium (formerly YouTube Red)

YouTube Premium is a subscription service that removes ads, allows background playback, and downloads videos for offline viewing. Subscribers also get access to YouTube Music Premium. The service costs approximately $11.99 per month (US, 2025).

4.3 YouTube Music and YouTube TV

YouTube Music is a dedicated music streaming app launched in 2018, offering official songs, albums, playlists, and live performances. YouTube TV is a live television streaming service offering over 100 channels, launched in 2017. Both require separate subscriptions.

4.4 Brand deals and sponsorships

Many creators earn significant income through brand partnerships, where companies pay for product placement, dedicated videos, or shout-outs. These deals are often negotiated directly or through influencer marketing agencies.

4.5 Merchandise and crowdfunding

Creators sell merchandise (clothing, accessories) through platforms like Shopify integrated with YouTube's merch shelf. Crowdfunding via Patreon, Ko-fi, or channel memberships provides additional revenue from dedicated fans.

5 Cultural impact

5.1 Influence on traditional media

5.1.1 Music industry and viral songs

YouTube has launched music careers, with artists like Justin Bieber (discovered via uploaded covers), Psy ("Gangnam Style"), and Lil Nas X ("Old Town Road") achieving global fame through the platform. Music videos are a primary way of distributing singles.

5.1.2 Television and film distribution

Networks and studios use YouTube for trailers, clips, and full episodes. Independent filmmakers distribute short films and web series. YouTube's original content, such as *Cobra Kai* (started as a paid series before moving to Netflix), demonstrates the platform's role in IP development.

5.2 Educational impact

5.2.1 Khan Academy and tutorial channels

Khan Academy, founded by Salman Khan, began as a series of YouTube tutorials. Educational channels like Crash Course, VSauce, and 3Blue1Brown have millions of subscribers, making complex topics accessible. YouTube has become a free alternative to traditional education.

5.3 Social impact and community building

5.3.1 Fundraising and charity campaigns

Creators have raised millions for causes through live streams and videos. Notable examples include "Despacito" by Luis Fonsi (charity concerts) and the "Hope Through Healing Hands" campaigns. The platform's Super Chat feature is often used for charity drives.

5.3.2 Awareness and activism

YouTube is used to spread awareness about social issues, from environmentalism to mental health. Documentaries and vlogs highlight personal stories. The platform has been both praised for amplifying voices and criticized for enabling misinformation.

5.4 Global reach and localization

YouTube is available in over 100 languages and has local interfaces in more than 80 countries. Content is often region-specific, with local creators, trends, and censorship policies shaping availability. The platform's global reach allows cross-cultural exchange of ideas and entertainment.

6 Technical aspects

6.1 Video compression and codecs

YouTube uses the VP9 and H.264 codecs for standard content and AV1 for higher efficiency. Variable bitrate encoding adjusts quality based on bandwidth. The platform supports 360-degree, VR, and 8K video, requiring specific codec support.

6.2 Content delivery network (CDN)

YouTube employs a global CDN using Google's infrastructure, with edge caching servers located near users. This reduces latency and buffering. The CDN handles over 1 billion hours of watch time per day as of 2024.

6.3 Mobile and smart TV apps

YouTube offers apps for iOS, Android, and most smart TV platforms (e.g., Apple TV, Roku, Samsung). The mobile app includes features like offline downloads (for Premium subscribers), casting, and Shorts. The TV app is optimized for remote navigation and 4K playback.

7.1 YouTube Kids

YouTube Kids is a child-friendly version launched in 2015, featuring curated content, parental controls, and no comments. It filters age-appropriate videos and restricts access to mature content. The app has faced criticism for occasionally surfacing inappropriate videos despite filters.

7.2 YouTube Gaming

YouTube Gaming was a separate app launched in 2015 focused on video game content. In 2019, YouTube integrated gaming features into the main platform, including a dedicated gaming hub. The app was discontinued, but gaming content remains a major category.

7.3 YouTube Shorts

YouTube Shorts is a short-form video feature introduced in 2020, allowing users to create and view 15- to 60-second vertical videos. Shorts include music, text overlays, and creative tools. The feature is designed to compete with TikTok and Instagram Reels. Shorts creators are eligible for the YouTube Shorts Fund, a $100 million pool for top performers.