What is steem definition?

Steem is a blockchain-based social media platform launched in March 2017. It allows users to create and publish content, as well as vote and comment on content created by others. The platform runs on a unique cryptocurrency called STEEM, which users can earn by creating and engaging with content. Steem aims to provide an alternative to traditional social media platforms by offering users control over their own data and content, as well as financial incentives for engagement and participation. The platform has several decentralized applications built on top of it, including DTube and Steemit.