Final answer:
Internal controls that apply to the complete IT system are known as general controls, ensuring the security and functionality of the IT environment and supporting application controls.
Step-by-step explanation:
Internal controls that apply overall to the IT system are called general controls. These controls are crucial in managing the security and integrity of an organization's entire IT structure, including its hardware, software, and related processes. General controls consist of policies and procedures that relate to many applications and support the effective functioning of application controls by helping to ensure the reliability of data generated by those systems. On the other hand, application controls are specific to individual software applications, ensuring the integrity of transactions and data within each application.