A glue gun is a handheld tool that uses heat to melt adhesive sticks, allowing users to bond materials together quickly and effectively. It is commonly used in crafts, home repairs, and various DIY projects. The melted glue cools and hardens rapidly, creating a strong bond between surfaces. Glue guns come in different sizes and types, including mini glue guns for smaller projects and industrial glue guns for larger applications. They typically operate on electricity or batteries and are popular among crafters, hobbyists, and professionals for their ease of use and versatility.