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QR codes can be used to log into websites: a QR code is shown on the login page on a computer screen, and when a registered user scans it with a verified smartphone, they will automatically be logged in. Authentication is performed by the smartphone, which contacts the server. Google developed this in 2012.
If you're having problems viewing and receiving your AOL Mail, it could be caused by a few things. Most of the issues can be fixed with a couple of quick troubleshooting steps.