Twitter is a microblogging and social networking service that allows users to send and read short messages called "tweets". Tweets are text-based posts that can be up to 280 characters long and are displayed on the user's profile page. Users can also interact with tweets by, among other things, tagging them with "Like", retweeting them or replying to them.

Twitter was launched in 2006 and has since become one of the most popular social media platforms in the world. It is used by individuals, businesses and organisations to share information and content and to connect with their followers.

In addition to its core features, Twitter also includes a number of tools and functions for users, such as the ability to create and use hashtags, follow other users and see their tweets in their feed, and send and receive private messages. Twitter is available on the web and as a mobile app on iOS and Android devices.