What does updating the iPhone/iPod iOS do?

What does updating the iPhone/iPod iOS do?

Http://www.apple.com/ios

Updating installs the newest version of iOS available for your iPhone/ iPod.

IOS is the "i" device Operating System. The newest iOS is iOS 6.It adds new features and functionalities. However, I heard there are quite a few bugs already in iOS 6, because it was recently released.

  • Will updating my iPhone apps affect my phone speed as how updating the Operating System (OS) will? Currently I'm using the iPhone 5s on iOS 8.3 I know if I were to update my phone to the latest OS I may notice some slowdown on my phone's performance, since it may not have the "muscle" to handle certain functions. Many apps now are optimised for iOS 9 and/or the 6th generation phones. Will my 5s' speed performance slow down if I update my apps? Will the app's performance slow down?
  • Will updating from ios 6.0.1 to ios 6.1.2 remove everything? I know that if you 'Majorly' update your iPhone it will erase everything from your iPhone like updating ios 4 to ios 6, but what if you are just updating your iPhone from ios 6.0.1 to ios 6.1.2 on the same version, is there any difference or it will also remove everything?
  • Updating iOS 6.1.3 to iOS 7 Beta? And i have an iPhone 4 running on Verizon, i'm trying to get the beta for iOS 7 because it looks really cool. I'm not computer ignorant, i just can't seem to find how to do this, my iPhone is not jailbroken or unlocked. I downloaded like 10 different files for ios 7 and they all give me an error saying they are not compatible
  • Is tbere any major différence between thé iPhone 6 and the 6s? Whooppeee is Xmas again and my daughter wants new 2nd hand) iPhone… 2 years ago almost bought her 5 before i réaliséd that it was 5s she wanted ( cos thé 5 sucks?) And I don't want to screw up this year…