A Roblox game server (also sometimes referred to as a host) is a server which is the authoritative source of events in a multiplayer video game. The server transmits enough data about its internal state to allow its connected clients to maintain their own accurate version of the game world for display to players. They also receive and process each player's input. Servers will generally host more than one game server, which will each be instances of game servers serving different places. When a user joins a game, his client, an instance of the Roblox software on the device, requests for a game server to be created if all of them are full or if there is no server, and then connects to it. Other clients on the computers of other users may then connect to that game server. This is the base of Roblox's multiplayer system.
Whenever a change occurs on a client (character movement, chat etc.), it is replicated to the server, which then replicates it to all the other clients connected to the game. Similarly, whenever a change happens on the server (generally because of the physics, or because of scripts), it is replicated to all the clients connected to the game.
- Sometimes, players would join a server to meet a famous or popular player, or to receive the Admin Egg on Egg Hunts.
- Players commonly seen when one plays a game are usually seen wearing free accessories, free clothes and/or items automatically granted to them after they created their account; although it is slightly less common to spot players wearing more expensive items/clothing. A user can join a server with a player wearing a very expensive item if he/she is lucky enough to find one.
- Some games, player will automatically wear the clothing that forced to wear instead of their default clothing such like prison games or some obbies.