What is Steemit?

Steemit is marketing as a block-based social media network and is built on the top of Steem, a complete and decentralized economy of social crypts.
Steemit is built on the block chain Steem, it is similar to the Bitcoin block string, but it is separate from it. Another name for blockchains is Distributed Accounting Technology (DLT). This means that it is a distributed database - many people keep copies that are spoken in order to stay up to date. The records are added to the string of blocks in sequential order. These records, or blocks, when added to the database, or string, can not be modified. They are immutable - read-only.
Steem is peer-to-peer. There is no central control. Developers, however, exert a great influence on the course of Steem.
Steem is like Bitcoin, Ethereum and other cryptocurrences, but in fact much more.
While Bitcoin miners earn rewards en bloc by solving difficult mathematical problems - called objective proof of work - Steem rewards users for subjective proof of work: creating and keeping (upvoting and flagging) content.
This is unique. And this offers you many opportunities to gain cryptocurrence, especially through content creation and retention.