How are white dwarfs entrance stars and black holes alike and different?

White dwarfs and black holes are both endpoints of stellar evolution, representing the final stages of stars, but they arise from different types of stellar remnants. White dwarfs form from stars that have exhausted their nuclear fuel and shed their outer layers, leaving behind a dense core primarily composed of carbon and oxygen. In contrast, black holes are formed from the gravitational collapse of massive stars after supernova explosions, where the core's mass exceeds the Tolman-Oppenheimer-Volkoff limit. While both are incredibly dense and have strong gravitational fields, black holes possess an event horizon beyond which nothing can escape, whereas white dwarfs can still emit light and heat due to residual thermal energy.