Solder is a metal ALLOY used in many different types of applications, such as electrical wiring and plumbing. It is made up of a combination of metals, including lead, tin, and sometimes copper or silver. CEMENT, JOIN, FUSE, WELD, BRAZE, and ALLOY are all terms related to the process of soldering. CEMENT is a material used to bind two surfaces together, while JOIN is the act of connecting two objects. FUSE is the process of melting two metals together, while WELD is the process of joining two pieces of metal by heating them until they become one. BRAZE is a similar process to welding, but it uses a filler material to JOIN two pieces of metal. Finally, ALLOY is a combination of two or more metals that have been melted together.