AFI was a punk and alternative rock group. AFI was an acronym for 'A Fire Inside,' which was the name of the official group site. (official AFI site) The greatest hit by AFI was 2006number 20 pop song Miss Murder. AFI did not make the pop top 20 again.
On the rock side, Miss Murder was a 2006number one rock hit too, and the biggest AFI rock song. Before AFI became well-known, AFI did the original song Totalimmortal. The Offspring later made Totalimmortal a 2000number 17 rock hit.