Apple has released iOS 12 for compatible iPhone, iPad, and iPod touch devices. Basically any device capable of running iOS 11 can run iOS 12, and with the software update focusing on performance improvements Apple is recommending that all eligible users update to iOS 12.
Assuming you have an device that supports iOS 12 you will find the software update available through the Settings app as well as the iTunes application, you can then use either to update the iOS 12 software.
The simplest way to update to iOS 12 for most users is through
