Myosins are a type of protein that play a crucial role in muscle contraction and movement within cells. They work by interacting with another protein called actin, forming structures that can pull and push, enabling muscles to contract. This process is essential for various bodily functions, from simple movements like walking to complex actions like heartbeats. In addition to muscle cells, myosins are found in many other types of cells, where they help transport cellular materials. They are often referred to as "molecular motors" because they convert energy from ATP into mechanical work, driving essential processes in living organisms.