Tell you the most famous song of Avril Lavigne?

Avril Lavigne has several hit songs, but one of her most famous songs is "Complicated." The song was released in 2002 and became a global hit, reaching number one in several countries. It is known for its catchy melody, relatable lyrics, and Lavigne's distinctive voice. "Complicated" helped establish Lavigne as a prominent figure in the pop-punk scene and contributed to her rise to fame.