# Introduction to plugins
Strapi is built around plugins of different kinds. There are the core plugins which are essential for your Strapi application to function, and therefore cannot be deactivated. But there are also other plugins, that can either be installed by default or not, to add more options and possibilities to your Strapi application.
Core plugins which include the Content Manager and the Content-Type Builder are documented in their own sections of the user guide as they are quite specific (see Introduction to the Content Manager and Introduction to the Content-Type Builder). This Plugins section focuses on how to manage plugins in general and provides documentation for the others, non-core plugins.
Plugins are managed, for anything related to installation and deletion, from Marketplace and Plugins, both available in the main navigation of the admin panel. Once installed, your plugins are added to the main navigation of the admin panel, from where they are directly accessible.