Experience Extensions let you extend Contentstack’s UI. It enables developers to customize Contentstack experience, by customizing Contentstack's default UI and behavior.
You can create three types of Experience Extensions within Contentstack: Custom Fields, Custom Widgets, and Dashboard Widget.
Contentstack provides prebuilt extensions for you to use in your content types. You can select and use any extension from this list.
You can also create a custom extension either by writing the code directly in the Contentstack’s repository, or you can host it on a URL of your choice and provide this URL when configuring your extension in Contentstack.
Refer to the list of all the Experience Extensions supported by Contentstack.