Could somebody explain how DELETE can be idempotent? Ex. "Request = DELETE ID 1" First request, ID 1 is deleted. Second request, ID 1 has already been deleted

Could somebody explain how DELETE can be idempotent? Ex. "Request = DELETE ID 1" First request, ID 1 is deleted. Second request, ID 1 has already been deleted. Third request, ID 1 has already been deleted.