# 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.