A hydrophobic coating is a specialized layer applied to surfaces to repel water. This coating creates a barrier that prevents water droplets from adhering to the surface, causing them to bead up and roll off. Commonly used in products like smartphones, glasses, and outdoor gear, hydrophobic coatings help keep items dry and clean. These coatings are often made from materials like silicone or fluoropolymers, which have unique chemical properties that enhance water resistance. By reducing water contact, hydrophobic coatings can also minimize damage from corrosion, staining, and other moisture-related issues, extending the lifespan of various products.