What is this Database ? NoSQL also known as the Non-relational or Distributed Databases. This was introduced by Carlo Strozzi in 1998, As describe in this name there are no any sql included to this NoSQL. So.. you wonder, then how are we suppose to store data without SQL. we don't need tables to store data in this databases. But there are four basic types in this database.Those four basic types allows to handle huge data and manage the traffic of it. Four basic types are, Column-Based Store :- HBase , Cassandra Key-Value Store :- Riak , Amazon S3 Document-Based Store :- CouchDB , MarkLogic Graph-Based Store :- Neo4J This databases are mostly used in industry,Because there have so many advanced data handling capacity and capability of huge traffic handling. Also MongoDB is the most famous NoSql Database in industry nowadays, Because this is an Opensource Database. and ebay sites are hosted in this d