Indirect fire refers to a method of delivering munitions where the projectile is launched at a high angle, allowing it to hit targets that are not in the direct line of sight. This technique is commonly used by artillery units, such as howitzers and mortars, to strike enemy positions from a distance. In indirect fire operations, the shooter relies on calculations and targeting data to determine the correct angle and distance for the projectile to reach its target. This method is effective for engaging hidden or fortified positions, as it can bypass obstacles and provide support to ground troops without exposing them to direct enemy fire.