Apple keeps on updating the IOS version regularly. So as an iPad user we can avail these updates. Here are some simple steps on how to check the version of IOS and get them upgraded to the latest version. Go to Settings -> select General -> Select Software Update. This will show you the current version of the IOS that is being installed.
When your iPad has got the latest version already installed it will say – Your software is up to date. When it is not it will start updating to the latest version.
The latest version of IOS as of December 16, 2012 is IOS 6.0.1