What the is main composition of cell membrane?

Main components forming the basic structure are phospholipids (sphingosin and glycerol derived) there is presence of glycolipids, precisely in the outer leaflet, also there may be steroids (cholesterol in most eukaryotes) In addition to these lipids, membrane comprises proteins (functionality) and carbohydrates. Theses components are different among each cells quantitatively and qualitatively.