The difference between sponge and foam lies in their definitions, characteristics, and applications.

Sponge is a porous material primarily composed of foaming resins, foaming aids, and adhesive resins, with polyurethane making up most of its content. It is characterized by good water absorbency, wear resistance, and shock absorption, and can be used for cleaning items and making shoe soles.

Foam refers to materials that have been foamed with plastic particles, which can be categorized into PU foam, conductive foam, and anti-static foam, among others. Foam's characteristics include its light weight, quick-pressure sensitive fixation, flexibility, and reliable performance, making it suitable for applications in electronics, aerospace, and other fields.