There is a new approach to databases called NoSQL that refers to ‘not only the structured query language (SQL)’ . Traditional databases have been focussed on schemas and used SQL for queries. Instead this rather new form of databases are schema-free and often distributed. They have an easy replication approach and have been mostly designed to work with big data.
More Information on NoSQL databases
There are over 200 databases These days and we recommend to have a look on this page.
We recommend to look at the following video to understand this topic better:
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