Final answer:
Close air support is a means of engaging enemy land forces that involves using aircraft to support friendly ground forces during combat operations. It provides immediate support to ground troops in direct contact with the enemy.
Step-by-step explanation:
Close air support is a means of engaging enemy land forces that involves using aircraft to support friendly ground forces during combat operations. Unlike air interdiction, which focuses on attacking enemy targets that support land forces, close air support is specifically tailored to provide immediate support to ground troops in direct contact with the enemy. This can include providing aerial reconnaissance, suppressing enemy positions, and attacking targets that pose a threat to friendly forces. Close air support plays a crucial role in enhancing the effectiveness and survivability of ground forces in combat.