Glue has been around for thousands of years and has been made from a variety of organic substances. The oldest glue discovered was a collagen-based adhesive that was 8,000 years old and used to hold utensils together. In the past, glue was made from animal-based collagen and traditionally obtained from horses, but now other animals, such as cattle and pigs, are more commonly used. However, most glue today is made without animal products. Advancements in biotechnology have led to the development of synthetic collagen, further reducing the reliance on animal-derived sources. Modern glues predominantly consist of synthetic materials, such as polymers and resins, which provide just as good, if not better, adhesive properties.

The manufacturing process of glue involves cooking the raw material in water and then adding chemicals to make the glue into various forms. To make the glue into various forms, such as brown, white, and clear glue, additives must be added. Some of the raw materials for the production of glue might be animal parts or fish. Hide glue is made from animal hide (animal skin) and is often used in woodworking. It may be supplied as granules, flakes, or flat sheets, which have an indefinite shelf life.

In summary, glue can be made from a variety of organic substances, including animal parts, fish, and synthetic materials. While animal-based glues were commonly used in the past, most modern glues are made without animal products.