Abbreviation of
网络游戏 wǎngluò yóuxì. Sub-categories:
端游 duānyóu (PC client games),
手游 shǒuyóu (mobile games),
页游 yèyóu (browser games),
主机游戏 zhǔjī yóuxì (console).
网游 typically implies persistent multiplayer worlds — versus single-player
单机游戏 dānjī yóuxì.