A LAN party is a social gathering of participants with personal computers or compatible game consoles, where a local area network (LAN) connection is established between the devices using a router or switch, primarily for the purpose of playing multiplayer video games together. LAN party events differ significantly from LAN gaming centers and Internet cafes in that LAN parties generally require participants to bring your own computer (BYOC) and are not permanent installations, often taking place in general-use venues or residences.
The size of these networks may vary from as few as two people to very large gatherings of a hundred or more. Small parties can form spontaneously and take advantage of common household networking equipment, but larger ones typically require more planning, equipment and preparation, even dedicated gaming servers. As of 2020, the world record for the size of a LAN party is 22,810 visitors, set at DreamHack, in Jönköping, Sweden.
Usually, smaller LAN parties consist of people bringing their computers over to each other's houses to host and play multiplayer games.
These are sometimes established between small groups of friends, and hosted at a central location or one that is known to all participants. Such events are often organized quickly with little planning, and some overnight events, with some stretching into days (or even weeks). Because of the small number of players, games are usually played on small levels and/or against bots.
A small LAN party requires either a network switch, with enough ports to accommodate all the players, or if all the computers have Wi-Fi capability, an ad hoc network may be set up. This allows two or more computers to connect over a wireless connection, thereby eliminating the need for a wired network, a fair amount of power, and suitable surfaces for all the computers. Providing refreshments is often also a duty of the host, though guests are usually asked to contribute. In larger parties where participants may not all know each other personally, an entry fee may even be charged.