Rebar reinforcement refers to the use of steel bars, or rebar, embedded in concrete to increase its strength and durability. Rebar helps the concrete withstand tension and prevents cracking, making it essential in the construction of foundations, retaining walls, patios, and other structures exposed to heavy loads or stress. The rebar is arranged in a grid or pattern and tied together before the concrete is poured, ensuring the finished structure is strong and long-lasting.