Format is a double-disc compilation album by English synthpop duo Pet Shop Boys. The album consists of B-sides from various singles released from 1996 to 2009 (Bilingual through Yes, or "Before" to "Did You See Me Coming?"). It is their second B-sides album after Alternative (1995), which collected B-sides from the time of their first version of "Opportunities (Let's Make Lots of Money)" (1985) through "Yesterday, When I Was Mad" (1994).