Myosin is a type of protein that plays a crucial role in muscle contraction and movement in cells. It works by interacting with another protein called actin, forming structures known as filaments. When myosin heads attach to actin, they pull on the filaments, causing the muscle fibers to shorten and contract. In addition to muscle cells, myosin is also found in other types of cells, where it helps with various functions such as cell division and transport of cellular materials. There are several types of myosin, each adapted for specific tasks within different cell types, highlighting its versatility in biological processes.