Tablets

Everyday, I really see a lot of people carrying tablets where ever they go. Mostly I see is like Ipad and Ipad 2 even though there are other brands out there. Not only adults carry it but kids also. But most of the time I see people playing angry bird on Ipad. So is it a really need to have this kind of gadgets? But I believe the reason why parents buy for kids is to keep them quiet especially during dinners so that they won't be so bising. But if you really give me any of this tablets, I will find it not useful as I will not have a real use for it.