The iPad Air 2 receives current updates. Maybe you also read about an iPad 2 which doesn't get iOS 10.
The iPad 2 came out in March 2011, and has been discontinued by Apple in March 2014. There are quite a few differences to the iPad Air 2, which was released in October 2014, and discontinued this March.
As the iPad shows an available update, it's possible (or even recommended) to install the latest iOS. Apple always includes security updates with every software.
Apple's updates are not as frequent as those of Windows devices. iOS 10.3.1 was released a month ago. 10.3.2 is supposed to come soon, but Apple usually won't release it until bugs and problems with the software are fixed. It's possible to join the Developer Beta or Public Beta program and test the software before it is published, thus helping Apple improve their iOS.
The iPad 2 came out in March 2011, and has been discontinued by Apple in March 2014. There are quite a few differences to the iPad Air 2, which was released in October 2014, and discontinued this March.
As the iPad shows an available update, it's possible (or even recommended) to install the latest iOS. Apple always includes security updates with every software.
Apple's updates are not as frequent as those of Windows devices. iOS 10.3.1 was released a month ago. 10.3.2 is supposed to come soon, but Apple usually won't release it until bugs and problems with the software are fixed. It's possible to join the Developer Beta or Public Beta program and test the software before it is published, thus helping Apple improve their iOS.