Instagram is a photo sharing app that allows users to upload and share photos with followers. However, the document outlines several important terms and policies users should be aware of regarding their privacy and content ownership. Specifically, it notes that by using Instagram, users agree to relinquish ownership rights over their photos and allow Instagram to use their content worldwide. The document also warns of potential privacy and safety risks to users, especially young people, from geotagging photos and oversharing personal information. Overall, it advises users to carefully read Instagram's terms and policies to understand how their data and content can be used.