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, allowing for easy application and removal. PSAs work by creating a bond through contact, making them versatile for various materials, including paper, plastic, and metal. These adhesives are formulated from polymers that provide the necessary tackiness and adhesion. PSAs can be found in everyday items such as post-it notes, medical bandages, and packaging materials. Their ability to adhere without additional tools makes them popular in both industrial and consumer applications.