Adsorbents are materials that can attract and hold particles, such as gases or liquids, on their surface. This process is called adsorption, which is different from absorption, where substances are taken in. Common examples of adsorbents include activated carbon and silica gel, which are often used to purify air and water by trapping impurities. These materials are essential in various industries, including environmental cleanup and pharmaceuticals. For instance, activated carbon is widely used in water treatment systems to remove contaminants, while silica gel is often found in packaging to keep products dry. Adsorbents play a crucial role in maintaining cleanliness and safety in our daily lives.