What does the term "indirect fire" mean in relation to mortars?

The term "indirect fire" specifically refers to the method of engaging a target without having a direct line of sight. This is a crucial concept for mortars, which are designed to launch projectiles at high angles, allowing them to strike targets that are not visible to the crew operating the weapon. Indirect fire tactics typically utilize a combination of calculations and target information to determine where the projectile should land, factoring in variables such as range, elevation, and wind conditions. This capability allows forces to reach enemy targets that are shielded by terrain or obstacles, making it a vital component of modern artillery and fire support operations.