Online Games are games that players can play through devices that are connected to the Internet, usually interacting between players or between players and the server system of the game in real time. Online games are usually free and the publisher benefits from In-App purchase. In it, the publisher is responsible for maintaining the server system and maintaining the game environment.
The current online games in the world are usually divided into categories:
MOBA: Tactical game, famous for Dota2, LOL
FPS: First-person shooter like CS GO, Crossfire