MySQL


 * MySQL: the Comic Sans of databases. Except Comic Sans has uses.
 * -- David Gerard

MySQL is a popular open-source database system using the SQL query language. Its files are stored with the field definitions in .frm files, the data in .myd files, and indexes in .myi files.

File format information

 * .frm files
 * .myd and .myi files

Other links

 * Wikipedia article
 * Official site