Hey please tell me.what's the meaning of jailbreak and factory unlocked in iphones?

I'm confused that what does it means. And should I purchase from a local shop?

Jailbreaking and Unlocking an iPhone are 2 completely different things.

Jailbreaking is basically the process in which you gain more power to customize your iPhone by adding all types of different looks to your screen display and changing the font type, color, size and so much more.

But an Unlocked phone is a phone on no contract meaning you're not locked onto one service and you have the freedom to jump from one provider to the next without any withdrawing fees. In order to do this, you will need to buy a sim card for the service you want to use for the iPhone and on top of that, you will need to buy an iPhone at the full price. For example, I'm planning on buying a new iPhone 4s 16gb, and those range from $520+ (depending on where you buy it from). Many people say that an unlocked phone cost more, but on the long run, if you put the amount of how much you spend for both an unlocked and locked phone, you're saving a lot of money (if you're using an unlocked phone) compared to those who spend their money on contract bills not knowing what they're really paying for.

And if you want to purchase from the shop, it all depends on you and your money. If you have the money to pay for the entire price for an unlocked iPhone, go ahead! Otherwise if you don't have enough money, you may want to stick with a contract phone.

As for Jailbreaking, once you get an iPhone, there are many tutorials and cool neat things you can do with your phone once its jailbrokened!