NoSQL database will give you the option to store your data in different formats which suit your business requirements rather than storing in a traditional way of RDBMS where you used to store in table format. There are different types of NoSQL DBs. We listed down those types in this blogs.
Document DB
We can store our data in JSON format. mongoDB and PostgresSQL are the examples of Document DB.
Wide column database
Data will be stored in table format which has rows and columns. But it will not follow relational model and joins like traditional RDBMS tables. Names and format of the columns can vary from row to row in a same table.
Cassandra DB is an example of wide column store.
Graph database
Graph databases are also NoSQL databases. It uses graph data model to store the data.
Neo4j is a graph database.