What is SteemData?

SteemData offers a database layer for Steem. It allows people to query for large amounts of data very fast, as well as construct complex aggregate queries.SteemData is using an awesome document based database called MongoDB. MongoDB is the 5th most popular database in the world (source), and is especially favored by younger developers.
Some people have reached out to me on steemit chat, and told me they're learning MongoDB just so they can use SteemData. I think this is pretty cool, and I commend your efforts.There is however a large group of developers out there whom are more familiar with SQL based databases, such as MySQL. These people were out of luck...until today.