● Steel rebar, short for reinforcing bar, is a steel rod used to strengthen concrete structures. Made primarily from carbon steel, it features ridges or deformations on its surface to bond tightly with concrete. ● Classified by strength and composition, common grades include ASTM A615 (carbon steel) and A706 (low-alloy). It enhances concrete’s tensile strength—critical since concrete is strong in compression but weak in tension. ● Widely used in construction for buildings, bridges, roads, and foundations, rebar comes in various diameters and lengths. It’s often tied into grids before concrete pouring, ensuring structural integrity under stress, loads, or environmental forces.