Server
Shores of Hazeron is a massive multiple online (MMO) game with a single shard, so all players are always on the same server cluster, the same universe if you will. A player can travel to any galaxy and chat with any other player always.
A server instead commonly refers to a "scene server", a server that is managing solar systems, or scenes.
Types of Servers
There are a number of different servers, and there might even be more than are officially known.
Scene Server
Every solar system is managed by a scene server. When a new solar system is generated or loaded into memory, it is allocated to a scene server. If a solar system is experiencing issues from heavy load or other issues, it might affect all other solar systems managed by the solar system's scene server.
It is most obvious when seen how a solar system being locked up in limbo causes some other solar systems to also lockup at random.
Mail Server
The mail servers manage all the mail. If the mail server goes offline, no mail will be received.
Login Server
The login server manages the account login. If the login server goes offline, no one will be able to login, but players already online may stay until they log off.
Starship
As of the Beta release of Hazeron Starship, the server and client aspects of the game were merged to provide a singleplayer experience. This means the server-side and client-side software all run on the player's PC.