Airless sprayers are painting tools that use high pressure to atomize paint, allowing for a smooth and even application on various surfaces. Unlike traditional sprayers that mix air with paint, airless sprayers deliver paint directly from the container through a nozzle, making them ideal for large projects like walls, fences, and decks. These sprayers are efficient and can handle thicker materials, such as latex paint and stains, without the need for thinning. They are commonly used by both professionals and DIY enthusiasts for their speed and ability to cover large areas quickly, resulting in a professional finish.