Linoleic acid is an essential omega-6 polyunsaturated fatty acid with two cis double bonds at positions 9 and 12. It serves as a precursor for arachidonic acid and eicosanoids, playing critical roles in cell membrane fluidity, skin barrier function, and inflammatory signaling pathways. Abundant in vegetable oils such as safflower, sunflower, and corn oil, it is vital for human nutrition as the body cannot synthesize it. Industrially used in soaps, cosmetics, and as a drying oil in paints. Chemically reactive due to unsaturation, prone to oxidation forming hydroperoxides.