Snapchat is a messaging app that allows users to send photos, videos, and messages that disappear after being viewed. It has features like Stories (photos/videos viewable for 24 hours), filters, and chat. To use it, download the app and create a profile. Snapchat allows users to create snaps with lenses, filters, stickers and send them to friends. It also has a memories feature to save snaps. Businesses can use public profiles, insights and engage with followers to effectively market on Snapchat. Regular posting of engaging content is important.