In Redux, an action is an object that represents an intention to change the state. It contains a type field that describes the action's purpose and any additional data necessary for the action. Actions are created by calling a function known as an action creator. Here is an example of an action creator in JavaScript:

javascript
 
 
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function addTodo(text) {
  return {
    type: 'ADD_TODO',
    text
  }
}

This action creator creates an action that adds a todo item to the state. The type field is 'ADD_TODO', which describes the action, and the text field contains the text of the todo item. You can learn more about actions in Redux from the official documentation: https://redux.js.org/basics/actions.