Final answer:
High-density lipoproteins (HDL) are considered "good" cholesterol as they collect cholesterol from other tissues and return it to the liver, reducing the risk of heart disease.
Step-by-step explanation:
High-density lipoproteins (HDL) are considered "good" cholesterol. HDLs collect cholesterol from other tissues and return it to the liver, thus preventing the buildup of cholesterol in the arteries and reducing the risk of heart disease.