Well, the whole idea of a European Renaissance presupposes that Europe was like an island unto itself that was briefly enlightened when the Greeks were ascendant and then lost its way and then rediscovered its former European glory. Furthermore, I'm going to argue that the Renaissance didn't even necessarily happen. But first, let's assume that it did. Essentially, the Renaissance was an efflorescence of arts, primarily visual but also to a lesser extent literary, and ideas in Europe that coincided with the rediscovery of Roman and Greek culture. It's easiest to see this in terms of visual art. Renaissance art tends to feature a focus on the human form, somewhat idealized, as Roman and especially Greek art had. And this classicizing is also rather apparent in the architecture of the Renaissance, which featured all sorts of Greek columns and triangular pediments and Roman arches and domes.