In plain language
An action is the work step that changes, sends, creates, or retrieves something in another system.
Example
After a form is submitted, an action creates a contact in the CRM.
Related terms
Trigger · Workflow · Integration
Common misconception
An action is not the whole automation; it is one step inside it.
Implementation guidance
Give each action one clear responsibility, map only necessary fields, and test both successful and failed responses.