What is the purpose of "screeding" in the process of concrete finishing?

Screeding serves the critical purpose of leveling the surface of freshly poured concrete to achieve the desired elevation and smoothness. During this process, a screed board is often moved across the top of the concrete, usually from side to side or back and forth, to eliminate excess material and fill in low spots. This step ensures that the concrete achieves a consistent thickness and surface profile, which is vital not only for aesthetic reasons but also for the proper functionality of the slab, particularly in applications like floors and pavements. By ensuring that the surface is flat and properly graded, the screeding process contributes to the overall quality and durability of the finished concrete work.