The cell membranes are mainly composed of :

Cell membranes are primarily composed of phospholipids, which form a bilayer structure. This phospholipid bilayer provides the basic structural framework of the membrane. While proteins (embedded within the bilayer or associated with its surfaces) are also crucial components, playing roles in transport, signaling, and other functions, and carbohydrates (attached to lipids or proteins as glycolipids or glycoproteins) are important for cell-cell recognition, the main constituent of the cell membrane in terms of its basic structure is phospholipids.