Instagram is an American photo and short-form video sharing social networking service owned by Meta Platforms. It allows users to upload media that can be edited with filters, be organized by hashtags, and be associated with a location via geographical tagging. Posts can be shared publicly or with preapproved followers. Users can browse other users' content by tags and locations, view trending content, like photos, and follow other users to add their content to a personal feed. A Meta-operated image-centric social media platform, it is available on iOS, Android, Windows 10, and the web. Users can take photos and edit them using built-in filters and other tools, then share them on other social media platforms like Facebook. It supports 33 languages including English, Hindi, Spanish, French, Japanese, and Korean.

Instagram was originally distinguished by allowing content to be framed only in a square (1:1) aspect ratio of 640 pixels to match the display width of the iPhone at the time. In 2015, this restriction was eased with an increase to 1080 pixels. It also added messaging features, the ability to include multiple images or videos in a single post, and a Stories feature—similar to its main competitor, Snapchat, which allowed users to post their content to a sequential feed, with each post accessible to others for 24 hours. As of January 2019, Stories was used by 500 million people daily.

The Burbn Beta app was made available for iOS on October 6, 2010, by Kevin Systrom and Mike Krieger — still as a prototype, but for the first time available as a real app on the App Store rather than a web-based prototype. The app received around 25,000 registrations that day, though it remained a public beta. Six days later, on October 12, 2010, the final stable non-beta version was officially released under a new name — Instagram. This renaming gave an even bigger response, it rapidly gained popularity, reaching 1 million registered users in two months, 10 million in a year, and 1 billion in June 2018. In April 2012, Facebook acquired the service for approximately US$1 billion in cash and stock. The Android version of Instagram was released in April 2012, followed by a feature-limited desktop interface in November 2012, a Fire OS app in June 2014, an app for Windows 10 in October 2016, and an app for iPadOS in September 2025. Although often admired for its success and influence, Instagram has also been criticized for negatively affecting teens' mental health, its policy and interface changes, its alleged censorship, and illegal and inappropriate content uploaded by users.

Instagram began development in San Francisco as Burbn, a mobile check-in app created by Kevin Systrom and Mike Krieger. On March 5, 2010, Systrom closed a $500,000 (equivalent to $700,000 in 2024) seed funding round with Baseline Ventures and Andreessen Horowitz while working on Burbn. Realizing that it was too similar to Foursquare, they refocused their app on photo-sharing, which had become a popular feature among its users. They renamed it Instagram, a portmanteau of instant camera and telegram.

Josh Riedel joined the company in October as Community Manager, Shayne Sweeney joined in November as an engineer, and Jessica Zollman joined as a Community Evangelist in August 2011.

On October 21, 2009, the first web-based prototype of Burbn was released online, although it was basic and non-functional, it featured a registration waiting list. The first Burbn post was a photo of South Beach Harbor at Pier 38, posted by Mike Krieger at 5:26 p.m. on July 16, 2010. On October 6, 2010, the Burbn Beta iOS app was made available through the App Store, though this was still just a prototype only. The final stable non-beta version was officially released 6 days later, on October 12, 2010 with a new name, Instagram. In February 2011, it was reported that Instagram had raised $7 million (equivalent to $9,601,662 in 2024) in Series A funding from a variety of investors, including Benchmark Capital, Jack Dorsey, Chris Sacca (through Capital fund), and Adam D'Angelo. The deal valued Instagram at around $20 million. In April 2012, Instagram raised $50 million (equivalent to $67,320,000 in 2024) from venture capitalists with a valuation of $500 million (equivalent to $673,200,000 in 2024). Joshua Kushner was the second largest investor in Instagram's Series B fundraising round, leading his investment firm, Thrive Capital, to double its money after the sale to Facebook.

On April 3, 2012, Instagram released a version of its app for Android phones, and it was

downloaded more than one million times in less than one day. The Android app has since received two significant updates: first, in March 2014, which cut the file size of the app by half and added performance improvements; then in April 2017, to add an offline mode that allows users to view and interact with content without an Internet connection. At the time of the announcement, it was reported that 80% of Instagram's 600 million users were located outside the U.S., and while the aforementioned functionality was live at its announcement, Instagram also announced its intention to make more features available offline, and that they were "exploring an iOS version". On April 9, 2012, Facebook, Inc. (now Meta Platforms) bought Instagram for $1 billion (equivalent to $1,346,000,000 in 2024) in cash and stock, with a plan to keep the company independently managed. Britain's Office of Fair Trading approved the deal on August 14, 2012, and on August 22, 2012, the Federal Trade Commission in the U.S. closed its investigation, allowing the deal to proceed. On September 6, 2012, the deal between Instagram and Facebook officially closed with a