**What is the primary function of high-density lipoprotein (HDL)?**
The primary function of high-density lipoprotein (HDL) is to transport cholesterol from peripheral tissues back to the liver, promoting its excretion and preventing plaque buildup in arteries. This process helps maintain cardiovascular health and lowers the risk of heart disease. HDL is often referred to as "good cholesterol" due to its protective role in reducing arterial blockages. Regular physical activity and a diet rich in healthy fats can help increase HDL levels, contributing to better heart health.