"Waterproof" refers to the ability of a material or object to resist the penetration of water. This means that when exposed to water, a waterproof item will not allow moisture to pass through it, keeping its contents dry. Common examples of waterproof items include rain jackets, watches, and smartphones designed for use in wet conditions. The effectiveness of waterproof materials is often measured by their water resistance rating, which indicates how well they can withstand water exposure. Different levels of waterproofing are suitable for various activities, such as swimming, hiking, or fishing, ensuring that users stay protected from water damage.