Triglycerides are a type of fat (lipid) found in the blood, composed of three fatty acid molecules bonded to a glycerol molecule. They serve as a major source of energy for the body and are stored in fat cells for later use. Elevated levels of triglycerides can be associated with various health issues, including cardiovascular disease and metabolic syndrome. Monitoring triglyceride levels is important for assessing overall health and metabolic function.