You can scan a QR-code with the camera of your mobile phones.
Scanning QR-code works on Android phones from version 9.0 and iOS from version 11.0. You can use your phone’s camera function to scan QR-code in these versions. All you have to do is point your camera at the code. After that, you will be redirected to a specific webpage. You can also scan QR-codes on older phones, but you will need a third-party app for that to work.