What is the difference between LDL and HDL cholesterol levels?

LDL (low-density lipoprotein) cholesterol is considered "bad" cholesterol because it can build up in the arteries, leading to Heart disease. HDL (high-density lipoprotein) cholesterol is considered "good" cholesterol because it helps remove LDL cholesterol from the arteries. Maintaining a balance between the two is important for heart health.