What is the difference between a glue and an adhesive?

The terms "glue" and "adhesive" are often used interchangeably, but there is a slight difference between the two.

Glue is a type of adhesive that is specifically used for bonding materials together. It is typically in a liquid or semi-liquid form and can be applied to the surfaces to be joined. Glue is commonly made from natural substances such as animal collagen or plant starch, or synthetic materials like polyvinyl acetate (PVA) or epoxy.

On the other hand, adhesive is a broader term that encompasses all substances used to bond materials together. It includes not only liquid or semi-liquid glues but also tapes, films, pastes, and other products that can stick surfaces together. Adhesives can be derived from various sources, including natural or synthetic materials, and they come in different forms such as liquid, solid, or even in the form of a tape.

In summary, glue is a specific type of adhesive, whereas adhesive is a more general term that encompasses a wider range of bonding substances and products.