You can choose to enable or disable any of the add-on components that are distributed with CiviCRM. These are:
Click Enable Components which brings you to the Enable Components page.
Enabled components are listed in the right-hand box. Disabled components are listed in the left-hand box.
Click on a component and then click the Enable or Disable button to move it from one box to the other.
Click Save to save your action or Cancel to cancel it.
If successful you will see the message "Your settings changes have been saved."
To learn more about each component, refer to their administration documentation.