When updating the iPad iOS it is always good practice to plug in your iPad so the battery does not drain through the updating process. If the battery does drain through the updating process it can make your iPad inoperable.
Checking For New iOS
Once in a while check that your iOS is upto date. Updated iOS is been thrown out on a regular basis giving you access to new features.
To check if your iOS is upto date open iTunes, select your iPad under devices in the left hand column and then summary. This will show you what iOS your iPad is running. If you want to check to see if your running the upto date iOS simply click on the “Check For Update” button.