E4 is a British television channel owned by Channel Four Television Corporation. It targets viewers aged 16-34 and primarily airs reality television shows and imported programs from the US and Australia. Popular US imports include The Big Bang Theory and RuPaul's Drag Race, while British shows like The Inbetweeners and Made in Chelsea are also featured. E4 launched as a subscription channel in 2001 before becoming free-to-air in 2004. It achieved its highest viewership with an episode of The Inbetweeners that garnered 3.7 million viewers. E4 is available on Sky, Virgin Media, and Freeview but lacks a free HD broadcast channel.