Wikipedia
KickassTorrents
KickassTorrents (commonly abbreviated KAT) was a website that provided a directory for torrent files and magnet links to facilitate peer-to-peer file sharing using the BitTorrent protocol. It was founded in 2008 and went offline on 20 July 2016, when the domain was seized by the United States government. The site's proxy servers were shut down by its staff at the same time.
In November 2014, KAT became the most visited BitTorrent directory in the world, overtaking The Pirate Bay, according to the site's Alexa ranking.
One of the main domains of the site went up for sale in August 2016.