What is the best cut for a diamond?

Good day! I'm curious to know, what exactly constitutes the "best cut" for a diamond? Is it purely based on visual aesthetics, or does it have to do with the technical aspects of how light is reflected and refracted within the stone? Could you elaborate on the factors that contribute to a diamond being considered well-cut, and perhaps provide some examples of popular cut styles that are often sought after? I'm eager to learn more about this aspect of diamond appraisal.