Changyou.com Limited is an online game developer and operator. The Company is engaged in the development, operation and licensing of online games for personal computers (PCs) and mobile devices. The Company's segments include Online Game segment, which consists of PC games, mobile games and Web games, and the Platform Channel segment, which consists primarily of online advertising services on the 17173.com Website, and a relatively small amount of Internet value-added services (IVAS). PC games are interactive online games that may be played simultaneously by hundreds of thousands of game players; mobile games are played on mobile devices and require an Internet connection, and Web games are online games that are played through a Web browser with no local game software installation requirements. The Company's 17173.com Website is an information portal in China, which provides news, electronic forums, online videos and other information services on online games to game players.