1. Phospholipids: These are the primary building blocks of cell membranes. They have a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail. This unique structure allows them to form a bilayer, which acts as a barrier between the cell's interior and the exterior environment.

2. Triglycerides: These are the most common type of fat in our bodies and are important for energy storage. They are composed of three fatty acid chains attached to a glycerol molecule.

3. Steroids: This group of lipids includes cholesterol, which is essential for cell membrane structure and function. Other steroids, such as hormones, play important roles in regulating various bodily functions.