The Apache/Perl integration project brings together the full power of
the Perl programming language and the Apache HTTP server.
With mod_perl, it is possible to write Apache modules entirely in Perl.
The persistent interpreter embedded in the server avoids the overhead
of starting an external interpreter and the penalty of Perl start-up
Note that you do not need mod_perl to run perl scripts via the common
gateway interface (CGI). mod_perl enables you to run Perl scripts in an
embedded interpreter if the additional performance is needed, but may
require modifications to the scripts.