Cholesterol plays a crucial role in the human body, primarily in maintaining cell membrane integrity and fluidity. It serves as a precursor for the synthesis of essential molecules, including steroid hormones such as cortisol, aldosterone, and sex hormones like estrogen and testosterone. Additionally, cholesterol is vital for the production of bile acids, which aid in the digestion and absorption of dietary fats. In the medical field, cholesterol levels are monitored to assess cardiovascular health, as imbalances can lead to conditions like atherosclerosis. It is also used in research to study lipid metabolism and develop treatments for cholesterol-related disorders.