Reinforcing bars, also known as rebar, are steel bars that are commonly used to reinforce concrete structures. They are made from carbon steel and come in a variety of sizes and shapes. The bars are placed in a grid pattern within the concrete to provide additional strength and stability. Rebar is an essential component in the construction industry, used in everything from buildings and bridges to highways and tunnels. It is an incredibly versatile material that is highly durable and can withstand a significant amount of stress and strain.