Lipid Bilayer: A thin polar membrane made of two layers of lipid molecules; these layers are hydrophobic on the inside, allowing them to form a barrier that protects the cell.
Phospholipid: A type of lipid molecule that is a major component of all cell membranes; it has both a hydrophilic (water-attracting) head and a hydrophobic (water-repelling) tail, allowing for the formation of cellular barriers.
Membrane Protein: Proteins embedded within or attached to the lipid bilayer of a cell membrane, some of which interact with the hydrophobic core to stabilize membrane structure or facilitate transport across the membrane