A Kodi addon is a simple application that lets you watch content from a specific source on your device. For example, you can install a Netflix addon to stream your favorite Netflix content on your Kodi device. Conversely, a Kodi repository is like an archive containing various add-ons, including music, program, video, etc. Whereas the Kodi build is a better way of using Kodi. It comes pre-configured with skins, settings, add-ons, and more.