A "front" in meteorology refers to a boundary that separates two different air masses with distinct temperatures and humidity levels. There are several types of fronts, including cold fronts, warm fronts, stationary fronts, and occluded fronts. Each type affects weather patterns differently, influencing conditions like temperature, precipitation, and wind. Cold fronts occur when a colder air mass pushes into a warmer air mass, often leading to thunderstorms. In contrast, warm fronts happen when warm air rises over cold air, typically resulting in gradual rain. Understanding fronts helps meteorologists predict weather changes and inform the public about upcoming conditions.