A weather front is a boundary in between two masses of air of different densities and is the main cause of significant weather, such as storms. Some fronts produce no precipitation and little cloudiness, although there is usually a wind shift. The weather usually quickly clears after a front passes.
A cold front is a meteorological word that is used to describe the movement of a cooler air mass into an area of warmer air. The air with greater density (the cold air) moves under the less dense warmer air, lifting it, which can cause a line of showers and thunderstorms. Cold fronts can also move up to twice as fast as warm fronts.