Pressure-sensitive adhesives (PSAs) are a type of adhesive that bonds to surfaces when pressure is applied, without the need for heat or solvents. They are commonly used in products like tape, labels, and stickers. PSAs can adhere to various materials, including paper, plastic, and metal, making them versatile for many applications. These adhesives work by creating a bond through physical contact, allowing for easy repositioning and removal. PSAs are often formulated to provide different levels of tackiness and durability, catering to specific needs in industries such as packaging, automotive, and electronics.