An online game is a video game that is either partially or primarily played through the Internet or any other computer network available.[1] Online games are ubiquitous on modern gaming platforms, including PCs, consoles and mobile devices, and span many genres, including first-person shooters, strategy games, and massively multiplayer online role-playing games (MMORPG).[2] In 2019, revenue in the online games segment reached $16.9 billion, with $4.2 billion generated by China and $3.5 billion in the United States.[3] Since 2010s, a common trend among online games has been operating them as games as a service, using monetization schemes such as loot boxes and battle passes as purchasable items atop freely-offered games.[4][5] Unlike purchased retail games, online games have the problem of not being permanently playable, as they require special servers in order to function.