The Xbox 360 can be updated, yes. However, you will need to connect online for it to do so. The way it works is that ever year, Xbox releases about 2 (sometimes 3) major updates that change various things like: the display, navigation system, the Xbox menu, fix bugs from previous versions, etc. These updates are usually installed in spring and in late fall or winter. In the previous update, Xbox added the avatars to the system as well as revamped the whole display, menus and much more!
No games will update your Xbox 360. When you insert a game and it asks you to update, this is a game update.
specify
yes
yes
It dose aromatically
No you can not.
yes you can you need to for it to work
The Xbox 360 can only play certain Xbox titles. A precise list of which Xbox games are compatible with the Xbox 360 is available on the Xbox website.
all can but most you need to manually update your Xbox the halo games and be played on Xbox 360
conect the charger to the xbox
yes it will but you may have to update the 360
Microsoft maintains a list of titles that are forward compatible with the Xbox 360. If the title you are trying to play does need an update to play that update will be applied when you first launch the game assuming that your Xbox 360 is connected to the internet.