You have to be the host of the server.
It depends on the server's owner. There is no way of unbanning yourself.
If its not your server you can not, the server owner only can. If you have your own server, go into the console of the server and type in /op YourMinecraftUsername
Computer/Control Panel/Uninstall a program.
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It does if you buy one from a company, but it doesn't if you set up one yourself. Go to the site in the related links for information on setting up a server yourself. Also, a little tip, you can only install plugins on your Minecraft server if you're running a Bukkit server.
You can not opp yourself, so to op be opped in a server that's not yours, you have to be opped by an opped person to be opped.
it's a plugin called Permissions.
Minecraft Wiki has a complete guide. The link can be found under 'Sources and related links' below this answer.
A dedicated Minecraft server is a server where you can play original Minecraft. Usually without plugins or mods.
you need to download the server pack to go on a server in minecraft classic
A minecraft server adress is the location on the internet in which the Minecraft server is stored on. Minecraft server addresses are often a set of four numbers, such as 000.000.000.000(:25565). If the owner of a large Minecraft server has a website, it is not uncommon for the address to be something like this: "hub.worldofkeralis.net".