Snapchat is an American multimedia social media and instant messaging app and service developed by Snap Inc., originally Snapchat Inc. One of the principal features of the app are that pictures and messages, known as "snaps", are usually available for only a short time before they become inaccessible to their recipients. The app has evolved from originally focusing on person-to-person photo sharing to presently featuring users' "Stories" of 24 hours of chronological content, along with "Discover", letting brands show ad-supported short-form content. It also allows users to store photos in a password-protected area called "My Eyes Only". It has also reportedly incorporated limited use of end-to-end encryption, with plans to broaden its use in the future.