[tlubinski]

MySql and Sqlite are relational database management systems (RDBMS), which hold databases that are based on relations. (Other RDBMS are e.g. Postgresql or MS SQL Server)

SQL is a programming language to manage data and data definition in RDBMS. ("SELECT * FROM users WHERE lastname = 'Smith';")

NoSQL is a term which describes database systems that don't understand SQL and usually work as key-value store. (Examples: Riak, Redis, MongoDB (document-based))