> 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:
TypeDescription
​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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