Shadow quality is not an effect, but it could help you with the visual results of a render. Have you noticed how shadows are somehow low quality in your renders? In Eevee, you will get real-time shadows based on a projection size that you can control in the Shadows field, as shown here:
Look at the Cascade Size parameter. This is set to 1024px by default. If you increase this to 4096px, you will see a much better shadow projection, as shown here:
Despite being a great option to improve your shadows, using such a choice might ...
