Low-density lipoprotein (LDL) is a type of lipoprotein, a complex molecule composed of lipids (fats) and proteins, that transports cholesterol through the bloodstream. LDL is often referred to as "bad cholesterol" because high levels of LDL in the blood can contribute to the accumulation of cholesterol in the walls of arteries, leading to the formation of plaque. This can increase the risk of atherosclerosis, heart disease, and other cardiovascular problems.

Unit 2,

Reference: Oxford Concise Colour Medical Dictionary (7th Edition, Kindle Edition) Oxford University Press 2020 ISBN-13: 978-0198836629, p1802