It really depends on the game. For example, The Fallout 3 Game of the Year version has the add-ons built into it. However, a game like Modern Warfare 2 requires you to re-download all the add-ons for that game. If you don't want to do that, you need the add-ons on your hard drive or on your memory card already.
No it is not a addon it is a game for its self
No, most addons will not get you banned. The only things that addons are allowed to do in game are approved by Blizzard. If Blizzard does not want an addon to do something, they just make it so that addon can not do it.
Healbot is an addon, which means it is third-party software. It is most often downloaded from a game or addon site like Curse, WoWInterface or the like. If you are unsure, check if any of your online friends use addons, and where they get them. You can also google "healbot addon" and find the download results.
Chatzilla is a IRC client as a addon to Mozilla Firefox web browser. It is mainly used by hackers and IT professionals. One should not use this addon without experience.
You can download an A380 addon for game called Flight Simulator X, or fsx for short.
download the addon. Should be on a zip file. Simply extract the file. place the folder with all the files in your >world of warcraft>interface>addons folder.
it depens
You can get the Eclipse if you download the FoC Addon Mod from z3r0x. To get this go to empireatwar.filefront.com and just search for z3r0x's FoC addon. The ship is available to the Empire, not the Consortium.
You need to have addon
Unless you are using a mail addon that modifies your mailbox window, there is a reply button on each piece of in-game mail you receive. Push that and you can reply to the mail that you receive.
Fsx in just one game where as FSX Gold is Fsx deluxe with the addon pack Fsx acceleration
For Ps3 and X-Box 360 you can download them then you can play or buy the addon with fallout 3: game of the year. Once you have the addon you want downloaded, depending on the one you have you will receive a message via radio broadcast and a new mission will come up on your pip boy