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. The ACL helps control the forward motion of the tibia and prevents excessive rotation of the knee. Injuries to the ACL are common, especially in sports that involve sudden stops, jumps, or changes in direction, such as soccer and basketball. ACL tears can lead to pain, swelling, and instability in the knee, often requiring rehabilitation or surgical intervention for recovery.