A "hit song" is a popular piece of music that achieves significant commercial success, often appearing on music charts like the Billboard Hot 100. These songs typically resonate with a wide audience, leading to high sales, streaming numbers, and radio airplay. Hit songs often feature catchy melodies, relatable lyrics, and strong production quality. They can come from various genres, including pop, rock, hip-hop, and country. The success of a hit song can launch an artist's career or solidify their status in the music industry.