Phospholipids are the main component of the cell membranes.
All cell membranes contains phospholipids.A phospholipid is made up of a phosphate group and glycerol. These materials forms the bilipid layers in cell membrane. The phospholipids in the cell membranes helps to regulate movement of materials in and out of cell by selective permission. The other component of the cell membrane are the proteins. They both make it a firm structural entity.