Rendering in Cycles

However, if you render in Cycles, you’ll need to increase the samples. Cycles uses samples to render, so if you don’t use enough samples, you’ll get a noisy image. Each sample refines the scene further, so with more samples, you get cleaner renders. This is handy for doing quick test renders and not spending lots of time because even if the render is noisy, you can get an idea of how everything is working, so you can change the number of samples based on how much time you have.

On the Render Properties tab, look for the Sampling panel and set the render samples to some higher number, such as 100. (Depending on your computer, this may result in a very slow render, so keep that in mind.)