Esports, or electronic sports, are video games that are played competitively for spectators and are typically played by professional gamers specialized in each specific game. The genres of esports ranging from real-time strategy, one-on-one combat, to team-based strategy.
Some esports, like most fighting games, Counter Strike: Global Offensive (or CS:GO) and Defense of the Ancients (Dota 2), function in a tournament circuit where multiple events can take place during the year, while others, such as League of Legends and StarCraft 2 have established leagues and seasons throughout the year, culminating to the ultimate world championship once every year.
The most popular international esports are League of Legends and CS:GO.
Some events are held completely over the internet, where the players log in and play over online servers. The largest events are held in person (on LAN, or a Local Area Network) and are usually held in larger stadiums. The finals of the 2016 League of Legends World Championship, for instance, was held at the Staples Center in Los Angeles, the home of the Lakers.