BARCODE
A Barcode or bar code is a method of representing data in a visual,machine readable form .initially ,barcodes represented data by varying the widths and spacings of parallel lines.These barcodes ,now commonly reffered to as linear or one dimentional (1D),can be scanned by special optical scanners called barcode readers.Later ,two dimentional (2D) varients were developed,usingrectangle,dots ,hexagons and other geometric patterns,called matrix code or 2D barcodes ,although they do not use bars as such .2D barcodes can be read or deconstructed using application software on mobile devices with inbuilt cameras,such as smartphones.
