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MySQL is an open-source Relational Database Management System (RDBMS) that is developed and supported by Oracle Corporation.
MySQL is supported on a large number of platforms, including Linux variants, OS X, and Windows. It also has APIs for a large number of languages, including C, C++, Java, Lua, .Net, Perl, PHP, Python, and Ruby.
MariaDB is a fork of MySQL with a slightly different feature set. It is entirely compatible with MySQL for most applications.