Minecraft also has a online multiplayer system. So you can play with you friends online
or through LAN(Local Area Network). LAN was introdused in Minecraft 1.3x, so you can play
Minecraft with your friends through a local network. Minecraft servers are made by people
through Minecraft's code 25565 on their Firewall. So people make awesome servers by building
them and then giving people the server IP(Internet Protocol).