Snapchat, created in September 2011, is a unique messaging app that allows users to send photos and videos that disappear after 10 seconds. Users can easily download the app and set it up by adding contacts, and they have the ability to create custom drawings and messages that can be shared for 24 hours in 'my story' or sent directly to specific recipients. Snapchat emphasizes ephemeral communication, with content disappearing shortly after being viewed.