What is the difference between a warm front and a cold front in terms of air mass interaction and weather?

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Warm fronts form when a warmer air mass advances over cooler air, and because the warmer air is lighter it slides up and over the cooler air along a relatively gentle slope. That gradual lifting leads to the development of widespread clouds and precipitation that is typically light to moderate but can last for many hours and cover large areas ahead of the front. After the front passes, temperatures rise and humidity often stays elevated. This contrasts with a cold front, where a colder air mass pushes under the warmer air, lifting it more abruptly and along a steeper boundary, usually producing a narrower band of heavier showers or thunderstorms. So the best description is the one that emphasizes the warm air sliding over cooler air, gradual ascent, and widespread light-to-moderate precipitation.