A clot is a thick mass formed when blood cells and proteins stick together to stop bleeding. This process, known as coagulation, is essential for healing injuries. When a blood vessel is damaged, platelets and proteins in the blood work together to create a clot, sealing the wound and preventing further blood loss. Clots can occur in various parts of the body and are usually beneficial. However, if a clot forms inappropriately, it can lead to serious health issues, such as deep vein thrombosis or stroke. Understanding how clots form helps in managing and preventing these conditions.