Vascular grafts are artificial or natural conduits used to replace or bypass damaged or blocked blood vessels. They are commonly used in vascular surgery to restore blood flow to various parts of the body, such as the heart, legs, or arms. Vascular grafts can be made from a variety of materials, including synthetic materials like Dacron or polytetrafluoroethylene (PTFE), as well as natural materials like veins harvested from the patient's own body or from a human or animal donor. These grafts are designed to be compatible with the body's tissues and to withstand the pressures and stresses of the circulatory system. Successful vascular grafts can improve blood flow, alleviate symptoms, and potentially save lives in patients with vascular diseases or injuries.