Firestore is google's new database. It's NoSQL database and it's amazing. It's fast and it's more intuitive and best part is you can now make queries with the database.
Now in case you have been aware with the firebase It's is amazing real time database but there were some limitations with that database.
It was amazing real time database but you can either sort or you can filter in that database but all these kind of a drawbacks which were in the firebase real time database now has been overcome into the firestore.
In the firestore you can chain up your queries and sorting and all kinds of queries that you can do in the NoSQL database.Read More...