The document discusses making your own local CPAN mirror using CPAN::Mini and CPAN::Mini::Inject to download and store modules from CPAN. It describes using the dpan script which utilizes MyCPAN::App::DPAN to index downloaded modules and store metadata in YAML files for later searching and installation from the local mirror without an internet connection. The local CPAN mirror can be used as an alternative to CPAN or CPANPLUS for faster offline module installation.