What exactly is jailbreaking in iphone?

And does jailbreaking iphone makes all paid apps free?
what are advantages and disadvantages of jailbreaking of iphone?

JAILBREAKING MEANS HAVING FULL ACCESS & CONTROL ON EACH & EVERY FEATURE OF your PHONE SW

ADV: you WILL BECOME SUPER USER
DISADV: you WILL LOOSE your WARRANTY & IF NOT DONE PROPERLY U PHONE WILL BE DEAD PERMANENTELY.

  • Which is a good iphone apps are good that tells you bus times exactly? One of my friend have a free app in iPhone that tells him bus times exactly correct. Which is a good reliable app that tells me bus times. Kindly tell me
  • What exactly is jailbreaking? So, I want to know what exactly is jailbreaking, what are the risks of doing that to your iPod/iPhone/iPad, and can it be undone? I'm kind of scared to do this, because it sounds illegal, and I'm afraid I might break my iPad. Also, how do you jailbreak, and what can you do once it's jailbroken?
  • What exactly is jailbreaking? - 1 Such as with an iphone or ipad. I'm getting a new ipad mini next week. Only using it on the Wi-Fi network. Would i be able to jailbreak it and if so can you get caught some kind of way because i know its illegal? Also what things can you do with it that you wouldnt have been able to do before?
  • What exactly is an unlocked iPhone? - 1 I want to buy an iPhone in Japan, but I'll return home next year. So I want to keep using it in Europe. I googled this and they said it was possible if I buy an unlocked iPhone. Do you know what this is? And do I have to do something special when returning to Europe?