Satellite cells are a type of stem cell found in skeletal muscle tissue. They play a crucial role in muscle growth, repair, and regeneration. When muscle fibers are damaged, these cells become activated, proliferate, and can either fuse with existing muscle fibers to help repair them or form new muscle fibers. These cells are located between the muscle fiber membrane and the surrounding basement membrane. They remain in a quiescent state until needed, making them essential for maintaining muscle health and function throughout a person's life. Their activity is particularly important after injuries or during intense physical training.