MySQL is an open source database language. It was named after founder Michael Widenius' daughter My. It is widely used today. Mid-sized companies such as Google, and Facebook and Twitter all use MySQL.
Basically, if you are dealing with a database, you are going to be using MySQL.
What about PostgreSQL, MongoDB, cassandra, simpleDb, DynamoDb, redis.io, etc ?
What about PostgreSQL, MongoDB, cassandra, simpleDb, DynamoDb, redis.io, etc ?