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Welded wire fabric (WWF) is primarily defined as a grid of steel reinforcing bars that are welded together at their intersections, resulting in a square or rectangular mesh configuration. It serves a critical role in construction, particularly in concrete applications, providing tensile strength and resistance to cracking. This grid formation allows for uniform distribution of load throughout the concrete slab it supports, enhancing overall structural integrity.

While the other options involve elements of mesh or reinforcement, they do not accurately capture the specific characteristics and intended use of WWF. For example, metal mesh reinforced with fibers refers to a different type of composite material that may include fibers for added structural benefits but does not involve welded bars. Wire mesh used for drainage purposes is typically a more open mesh and does not provide the same reinforcement to concrete as WWF does. Reinforced plastic grids pertain to lightweight applications and lack the necessary strength characteristics associated with welded wire fabric, which is specifically designed for use in concrete reinforcement in heavy-duty applications.

Thus, the use of welded steel bars, the specific mesh design, and its application in reinforcing concrete make the correct identification of WWF as a square or rectangular-shaped mesh of reinforcing bars welded together essential in understanding its role in construction.