"Amphipathic" refers to molecules that have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts. This unique structure allows them to interact with both water and oil, making them essential in biological systems. A common example of amphipathic molecules is phospholipids, which form the cell membrane, creating a barrier that separates the inside of the cell from its environment. In addition to phospholipids, other amphipathic substances include certain detergents and proteins. These molecules can help stabilize emulsions, which are mixtures of oil and water, by reducing surface tension. Their dual nature is crucial for various processes, including the formation of cellular structures and the functioning of enzymes.