Lipoproteins are complex particles made of fats and proteins that transport lipids, such as cholesterol and triglycerides, through the bloodstream. They play a crucial role in maintaining lipid balance in the body and are classified into different types based on their density, including chylomicrons, low-density lipoproteins (LDL), and high-density lipoproteins (HDL). Each type of lipoprotein has a specific function. For example, LDL is often referred to as "bad cholesterol" because it can lead to plaque buildup in arteries, increasing the risk of heart disease. In contrast, HDL is known as "good cholesterol" as it helps remove excess cholesterol from the bloodstream, promoting cardiovascular health.