A lipid bilayer is a double layer of lipid molecules that forms the basis of cell membranes. This structure consists of hydrophobic tails facing towards each other and hydrophilic heads facing outward, creating a barrier that separates the inside of the cell from its external environment. Lipid bilayers are essential for the integrity and function of cells, as they regulate the passage of molecules in and out of the cell, provide structural support, and serve as sites for cell signaling and communication. Research in lipid bilayers focuses on understanding their composition, structure, and dynamics, as well as their role in various cellular processes and diseases. This research area is interdisciplinary, drawing on concepts from biology, chemistry, physics, and materials science to elucidate the properties and functions of lipid bilayers in biological systems.