Life is too short to run proprietary software.
Add-ons consist of small programs designed to add extra features, services, and capabilities to Kodi. Thousands already exist. More are being created pretty much daily. Third parties (groups or individuals unrelated to the Kodi developers) create these add-ons. Most are not supported by the Kodi folks.
Add-ons fall into several categories, which you will learn how to use in selecting downloads in the “Download Add-ons” section later in this chapter. Here’s a list to give you an idea of finding add-ons for ...