If you are the OP of the server, then you have commands such as "/kick", "/ban", "/ban-ip", or "/whitelist".
/kick simply kicks the player off of the server, it doesn't keep them off the server simply because its only a kick. the syntax for the command is "/kick <username> [reason]".
/ban adds the player to the blacklist, kicks them off the server, and keeps them off. The syntax for this command is "/ban <username> [reason]", keep in mind this is permanent until you remove the ban with "/pardon". If you want to do temporary bans then that requires server plugins. These commands are for regular vanilla minecraft. This command only bans the specific username.
/ban-ip adds the player's IP to the blacklist, which means when you use this command, he won't be able to log on with any other minecraft accounts that he may have. So this command is kinda like another step up from "/ban".
Each server can also have a whitelist to make the server public or private. When the whitelist is disabled the server becomes public, if you enable the whitelist then the server becomes private.
Enable Whitelist: "/whitelist on"
Disable Whitelist: "/whitelist off" (Disabled by default)
Add someone to the whitelist (allows them to enter the server) "/whitelist add <username>"
Remove someone from the whitelist "/whitelist remove <username>"
List people on the whitelist: "/whitelist list"
Reload the Whitelist: "/whitelist reload"
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A LAN world means if someone is playing Minecraft using the same modem/router as you, they can come into your world and play with you.
LAN means Local Area Network. LAN World on Minecraft basically means that anyone else playing from the same router/modem as you can join your world.
You can play LAN multiplayer in the latest version. You just use the menu option to open the world for LAN connections and send the IP to someone else connected to your LAN.
Yes with LAN. Just get your friend to open a single player world to LAN and then click on multiplayer and select his world
you send a redstone signal to it