Use the built-in camera app on your Android device to scan a quick response (QR) code, or use a code scanner on older models.

Not all smartphones require a third-party app to scan QR codes. Kurt "CyberGuy" Knutsson shows you how to scan codes using iPhone or Androids.

Some developers would lead you to believe you need to download their app to scan QR codes. Spoiler: Your phone can do that with built-in features.

In terms of privacy, QR codes can’t actually store data—they just display it. How much information about yourself you’re giving away depends on the app you’re using to scan.