Actin filaments, also known as microfilaments, are thin, thread-like structures made of a protein called actin. They are a key component of the cytoskeleton, which provides structural support to cells. Actin filaments are involved in various cellular processes, including maintaining cell shape, enabling movement, and facilitating cell division. These filaments are dynamic, meaning they can rapidly grow and shrink as needed. They interact with other proteins to form structures like muscle fibers and play a crucial role in processes such as cell motility and intracellular transport. Their versatility makes them essential for many cellular functions.