Xbox 360 dating
You can check out this extensive guide, along with this one, which both specify which games work in what regions.There are several games that work in all three regions. Now imagine that you live in Europe and you're moving to the United States. If you're on vacation in a different region, you can simply change your locale and rent some video games from that region.
Also, there are some video games which can be played in several regions.
Once the Xbox 360 is modified, you can either change the region of the game or turn your Xbox region free.
If you want the keys to the Xbox kingdom, just watch this video tutorial that shows you how to burn Xbox 360 games perfectly every time.
But you can actually do something about it and download and burn Xbox 360 games with a few programs and a little knowhow.
Also, it voids the warranty and it's possible you can be banished from Xbox LIVE if not done properly.
If you do happen to get banned, you can try tricking the system and un-banning yourself with this trick from Null Byte.