NoSQL is also known as "not only SQL," because some NoSQL databases do support SQL elements. But most don’t share key traits of relational databases like atomicity and consistency, and achieves higher horizontal scaling and higher availability. It is being developed at google, amazon, Facebook, and yahoo.
NoSQL is not as structured as traditional RDBMS, though attempts to retrieve data in a more loose manner, taking advantage of the flexibilities offered by other unstructured data models: CRM, ERP, BPM, etc. These use the flexibility to store their data without performing changes on tables or creating generic columns in a database.
Its first appearance occurred in 1998 with the term NoSQL by Carlo Strozzi. It is the new SQL that is catching on quickly in the current relational space.
en.wikipedia.org/wiki/NoSQL
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