> For the complete documentation index, see [llms.txt](https://developers.make.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.make.com/custom-apps-documentation/app-components/modules.md). # Modules There are six basic types of modules:

Type	Description
Action	Use if the API endpoint returns a single response. For example, Create a book, Delete a book, or Get a book.
Search	Use if the API endpoint returns multiple items. For example, List books finds specific books according to search criteria.
Trigger (polling)	Use to watch for any changes in your app or service. For example, Watch a new book is triggered whenever a new book has been added to the library.
Instant trigger (webhook)	Use if the API endpoint has a webhook available (dedicated or shared). For example, Watch a new event.
Universal	Use to enable users to perform an arbitrary API call to the service. For example, Make an API call and Execute a GraphQL query.
Responder	Use to send processed data back to a webhook.

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