Air Front

Air front explained in an easy to understand way:

Imagine you're at a crowded party where half the room is filled with people who love dancing and the other half with people who prefer sitting and chatting. Just like how the dancing enthusiasts and the chatty sitters create a noticeable divide at the party, an air front is the boundary where warm, energetic air masses meet cooler, more stationary ones. In this analogy, the dance floor represents the warm, active air mass, the sitting area symbolizes the cooler, calm air mass, and the boundary where they meet is the "air front," much like the line dividing the dancers from the sitters.