The Anterior Cruciate Ligament (ACL) is a key ligament located in the knee joint. It connects the femur (thigh bone) to the tibia (shin bone) and plays a crucial role in stabilizing the knee during movement, especially in activities that involve sudden stops or changes in direction. Injuries to the ACL are common in sports, particularly in activities like soccer, basketball, and skiing. These injuries can lead to pain, swelling, and instability in the knee, often requiring rehabilitation or surgical intervention to restore function and stability.