LDL, or low-density lipoprotein, is a type of cholesterol that can build up in the arteries and increase the risk of heart disease. There are several synonyms for this important molecule, including "bad cholesterol," "low-density lipids," "low-density lipoprotein cholesterol," and "non-HDL cholesterol." These terms are often used interchangeably in medical discussions and can help clinicians and patients identify and track LDL levels. Other related terms include "atherogenic cholesterol" and "lipoprotein(a)," which are both considered risk factors for cardiovascular disease. High LDL levels can be managed through dietary changes, exercise, and medication in some cases.