Generic name for print based tag technologies that represent data with colored (often black) or white space to store numbers or text. Several different barcode formats exist. Barcodes can either be 1d (one dimensional) and represent data using lines or 2d (two dimensional) and represent data as pixels. Barcodes are produced via printing technologies.
Barcodes are very cheap to produces compared to other tag technologies.
Barcodes offer no security features; they are trivial to clone. Barcodes should not be used to store sensitive information or be used for anti-cloning or anti-counterfeiting.