Ground-controlled approach is a term often used in aviation to refer to a specified procedure for aircraft to land safely and efficiently. There are various synonyms for this term, such as ground-controlled descent, ground-controlled landing, and ground-controlled approach and landing system. These terms refer to the same concept, which is the guidance provided to the pilot from the ground to ensure a safe landing. Other synonymous terms include precision approach, instrument approach, and the instrument landing system. All of these phrases describe the process of landing a plane with the use of advanced systems and expert guidance from controllers on the ground.