what are No SQL databases?

 NoSQL databases (Not Only “Structured Query Language”)

SQL databases – Relational and OLAP
Non-SQL databases – Key value, Column-Family, Graph, Document

Non-SQL, or non-relational, databases are still in rapid growth stage versus the already matured SQL stores. The pro of non-SQL databases, thanks to the open-source innovations from Hadoop since 2005, is their free upfront investment and flexible structures, enabling infinite more data that do not fit into a neat table to be captured.

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