Pressure-sensitive adhesives (PSAs) are sticky substances that bond materials together when pressure is applied, without the need for heat or solvents. They are commonly used in products like tape, labels, and stickers, allowing for easy application and removal. PSAs work by forming a bond with the surface of the materials they adhere to, making them versatile for various applications. These adhesives can be made from different materials, including rubber, acrylic, and silicone. Each type offers unique properties, such as temperature resistance or flexibility, making them suitable for specific uses. PSAs are widely utilized in industries like packaging, automotive, and electronics for their convenience and effectiveness.