QR (Quick Response) codes have been used since the 90s. These are square bar codes that can be read via QR code scanners and smart phone cameras (using QR code scanning applications). These codes have been used on almost everything such as T-shirts, magazines, billboards, visiting cards etc. It is convenient to have a QR code on your visiting card so that any smart phone owner with the QR code scanning application can read your card and save a digital copy for future use.
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