Snapchat is a multimedia messaging app that allows users to send photos, videos, and messages, which are known as 'Snaps.' These Snaps are designed to disappear after they have been viewed by the recipient. The app also provides a wide range of interactive filters and effects for photos, as well as features such as Stories, which are collections of Snaps viewable by friends for 24 hours. Additionally, Snapchat offers a subscription service known as Snapchat+ that provides features like exclusive experimental and pre-release features, Snapchat badge, customization capabilities, and premium support options.