Both grapes and their product wine were a prominent symbol in many of the ancient civilisations. They can be eaten as is for a sweet snack, or used to produce deserts and more involved products like wine.
Grapes aren't overly nutrient-dense, notably only containing minor traces of vitamin K and copper. The more important aspect of grapes' nutritional profile is its phytonutrients including resveratrol and proanthocyanidin, associtation with cardiovasular health. There is however contention around wine's role in human health.