What is the biggest selling song by the Foo Fighters?

The biggest selling song by the Foo Fighters is "Best of You," released in 2005. It has become one of the band's most iconic tracks and is widely recognized for its powerful lyrics and emotional delivery. The song has achieved significant commercial success, contributing to the Foo Fighters' reputation as one of the leading rock bands of their era. Its enduring popularity has solidified its status in the band's discography.