The type of cholesterol considered "bad" for heart health is known as low-density lipoprotein (LDL) cholesterol. Elevated levels of LDL cholesterol can lead to the buildup of plaque in the arteries, increasing the risk of heart disease and stroke. In contrast, high-density lipoprotein (HDL) cholesterol is often referred to as "good" cholesterol because it helps transport excess cholesterol away from the arteries. Maintaining a healthy balance between LDL and HDL cholesterol through lifestyle changes such as diet and exercise is essential for overall cardiovascular health.