Cholesterol is a waxy substance found in the body's cells and blood; it is essential for producing hormones, vitamin D, and bile acids. In nutrition, it is significant because there are different types—primarily LDL (low-density lipoprotein) and HDL (high-density lipoprotein). While LDL is often called "bad" cholesterol and can lead to plaque buildup in arteries, HDL is considered "good" cholesterol as it helps clear LDL from the bloodstream. Maintaining a balanced cholesterol level is crucial for cardiovascular health and overall well-being.