All kinds of interesting or useful information can be found in QR codes, but most Android devices don't have a dedicated function or application capable of reading them. This is where QR Code Reader comes into play.
The application is fully capable of reading QR and simple bar codes, and it even comes with flashlight support for low-light environments. Furthermore, the application can use QR codes to connect to a Wi-Fi network without needing the password.
It's important to mention that not all bar codes are going to be recognized, and it very much depends on your country.