Actin-binding proteins are a diverse group of proteins that interact with actin, a key component of the cytoskeleton in eukaryotic cells. These proteins play crucial roles in regulating the dynamics of actin filaments, influencing processes such as cell shape, motility, and division. They can promote the assembly or disassembly of actin filaments, thereby controlling the structure and function of the cytoskeleton. Some actin-binding proteins also serve as scaffolds, linking actin filaments to other cellular components, which helps organize the cell's interior. Examples include profilin, which facilitates actin polymerization, and cofilin, which severs actin filaments to promote turnover. Together, these proteins are essential for maintaining cellular integrity and facilitating movement.