A "Growth Factor" is a naturally occurring substance, often a protein, that stimulates cellular growth, proliferation, and differentiation. These factors play a crucial role in various biological processes, including tissue repair, immune responses, and development. They are essential for maintaining healthy cellular functions and can influence how cells respond to their environment. In medicine, growth factors are used in therapies to promote healing and regeneration. For example, Platelet-Derived Growth Factor (PDGF) is utilized in wound healing, while Vascular Endothelial Growth Factor (VEGF) is important for blood vessel formation. Understanding growth factors is vital for advancements in regenerative medicine and cancer treatment.