Catalyst is a web framework for Perl that allows developers to build dynamic web applications in a modular, reusable way. It utilizes common Perl techniques like Moose, DBIx::Class and Template Toolkit to handle tasks like object modeling, database access and view rendering. Catalyst applications can be built in a model-view-controller style to separate application logic, data access and presentation layers. This framework provides a standard way to write reusable code and build web UIs for tasks like system administration and automation.