Reinforcing bars, commonly known as rebar, are steel bars used to strengthen and support concrete structures. They are embedded within concrete to improve its tensile strength, as concrete is strong in compression but weak in tension. The bars come in various sizes and grades, allowing engineers to choose the appropriate type for specific construction needs. Typically, rebar is made from carbon steel and has a ribbed surface to enhance the bond with concrete. It is widely used in construction projects such as buildings, bridges, and roads, ensuring that these structures can withstand various forces and loads over time.