If you plan to use a MySQL database, then the driver is DBD::mysql. It is a XS implementation of the MySQL driver, and it is fast and reliable.

Alternatively, there is DBD::mysqlPP, a pure perl implementation of the driver, which is slower and not 100% compatible with the former. It is only advisable in cases when you can't install the real stuff (for example, when you don't have the rights to run a C compiler and your admin won't install the driver).

You may get some more information in the Tutorials section. Reading from a database should be a good start. More useful information at the DBI FAQ

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