What is the benefit of rendering?

Could you please elaborate on the advantages of rendering? I'm particularly interested in understanding how it enhances the quality of visual presentations and how it contributes to the overall efficiency of the production process. Does rendering improve the realism of graphics, or does it serve a more functional purpose? Also, I'm curious to know if rendering can be used to optimize resource usage and minimize computational costs. Could you provide some examples or scenarios where rendering has been particularly beneficial? Thank you for shedding light on this fascinating aspect of graphics design and production.