HDL cholesterol is also known as "good cholesterol" and "high-density lipoprotein". It is a type of cholesterol that helps remove excess cholesterol from the bloodstream and transports it back to the liver where it is broken down and excreted from the body. Other synonyms for HDL cholesterol include "healthy cholesterol", "protective cholesterol", and "beneficial cholesterol". High levels of HDL cholesterol have been associated with a lower risk of heart disease, while low levels increase the risk. Eating a healthy diet, exercising regularly, and quitting smoking can all help increase HDL cholesterol levels and improve overall cardiovascular health.