Glue is a substance that can bond two objects. Glue does not exist independently. It must be applied between two objects to play a bonding role. The chemical composition in the glue, in an aqueous environment. The polymer in the glue (vinyl acetate in the white glue is a kind of petroleum derivative) is a round particle, and the radius of the particle is generally 0.5~5 μ M.

Common adhesives include instant adhesive (common - 1203 instant adhesive - ethyl cyanoacrylate strong instant adhesive is one kind), epoxy resin adhesive, anaerobic adhesive, UV adhesive (UV curing), hot melt adhesive, pressure sensitive adhesive, latex, etc.