Hot melt adhesives are typically all-solid mixtures based on thermoplastic polymers made to increase productivity while also lowering expenditure and minimizing wastage. They are rigid at room temperature but become liquid when heated above their melting point, after which time they can be processed.

They maintain the capacity to moisten the surface after application until they solidify, then being technically odorless and virtually invisible. These adhesives can revert to their physical state with structural integrity and the ability to operate as an adhesive after solidification in seconds, therefore proving very time and cost-effective. Extruding, rolling, or spraying the mixture is used to apply it, and joining is done immediately after application or after warming the hardened layer.

This class contains a large range of polymers, including both natural and manmade polymers. They are usually treated as an ideal category of adhesives for fast application, great convenience, and long-lasting bond. As they are unnoticeable due to their transparency, they are also often used for works on open or visible surfaces to maintain the existing aesthetics of the place and product.