QR is short for Quick Response (they can be read quickly by a cell phone). They are used to take a piece of information from a transitory media and put it in to your cell phone.
A barcode is a square or rectangular image consisting of a series of parallel black lines and white spaces of varying widths that can be read by a scanner. Barcodes are applied to products as a means of quick identification.
Barcodes make doing business much more efficient for companies. Barcodes provide a method to track and store information about goods, from individual items to large stocks of thousands or even millions of items. They serve an important role and provide advantages compared with manually entering information.
A popular Barcode scanner App you can use is the QR and Barcode Scanner.
To scan a QR code or barcode simply open the app, point the camera at the code, and you’re done! There is no need to take a photo or press a button. Scan will automatically recognize any code your camera is pointing at.
So before you start using that drug, or consume that food why don’t you take the time to scan and verify it.