Quick meaning
The camera function on a phone that reads QR codes and interprets the information in them.
Think of it like this
Like a barcode reader at a supermarket, but built into your phone camera.
Where you may see this
You may hear this when buying a device, asking for repairs, or checking phone and computer settings.
Why it matters
Understanding the hardware term helps you choose the right device and explain problems more clearly when asking for help.
Say it simply
QR Scanner means: The camera function on a phone that reads QR codes and interprets the information in them.