CRUD stands for Create, Read, Update, and Delete. These are the four basic operations that are commonly used to manipulate data in a database.

In CakePHP, CRUD functionality can be implemented using the built-in Scaffold component. The Scaffold component provides a simple and rapid way to create a basic user interface for performing CRUD operations on a model.

To use the Scaffold component in a CakePHP controller, you will need to do the following:

1. Enable the component in your controller: Add the following line to your controller’s initialize method to enable the Scaffold component:

$this->loadComponent('Scaffold');

2. Use the scaffold action in your controller: You can use the scaffold action in your controller to handle the CRUD operations for a model. For example:

public function scaffold($modelClass = null) {
  $this->Scaffold->execute();
}

This will enable the Scaffold component for the controller, and allow you to perform CRUD operations on the model associated with the controller.

By following these steps, you should be able to use the Scaffold component to quickly and easily implement CRUD functionality in your CakePHP application.

Note: The Scaffold component is intended for rapid prototyping and development, and is not recommended for use in production applications. For more advanced CRUD functionality, you can create your own controller actions and views to handle the CRUD operations. You can also use the bake shell command to generate controllers, models, and views for your application.