Windows 10

1. For Windows 10, right-click on the "Windows" symbol on the toolbar and select "System."
2. Alternatively, type "winver" in the search toolbar.

Windows 7

1. For Windows 7, go to the Start Menu, then right-click on "Computer." Select "Properties."

Mac OS X

1. Go to the Apple Menu of your Mac, then select "About This Mac."

iOS Devices

1. Go to your iPad or iPhone's home screen, then touch the "Settings" icon.
2. From there, select "General."
3. Next, tap "About." You'll see all of the information about your device, including the version of your iOS device.

Android Devices

1. Go to the home screen of your device.
2. Touch "Settings," then touch "About Phone" or "About Device."
3. From there, you can find the Android version of your device.