A sunny-side-up egg is cooked on one side only until the whites are set, leaving the yolk runny and visible on top. By contrast, an over easy egg is flipped after cooking on one side, resulting in a runny yolk and a lightly cooked top. An over medium egg is flipped and cooked slightly longer, so the yolk is partially cooked, creating a creamy texture. Finally, an over hard egg is flipped and cooked until both the whites and yolk are fully set, resulting in a firm yolk and a well-cooked egg overall. Each variation offers a different level of yolk doneness.