Cholesterol serves multiple essential roles in the body, including the formation of cell membranes, the production of certain hormones, and the synthesis of vitamin D. While the body produces the necessary cholesterol, dietary sources can also contribute to overall levels. It's important to distinguish between LDL (low-density lipoprotein) and HDL (high-density lipoprotein); high levels of LDL, known as "bad cholesterol," can lead to atherosclerosis and cardiovascular diseases, whereas HDL can help remove cholesterol from the bloodstream.