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Although initially used to track parts in vehicle manufacturing, QR codes are used over a much wider range of applications. These include commercial tracking, warehouse stock control, entertainment and transport ticketing, product and loyalty marketing, and in-store product labeling.{{Citation needed|date=March 2023}} Examples of marketing include where a company's discounted and percent discount can be captured using a QR code decoder that is a mobile app, or storing a company's information such as address and related information alongside its alpha-numeric text data as can be seen in telephone directory [[yellow pages]].{{Citation needed|date=March 2023}}
[[File:Food Expo and Poultry Expo 2025 (01).webm|thumb|right|Demo of printing a QR code]]
They can also be used to store personal information for organizations. An example of this is the [[Philippines]] [[National Bureau of Investigation (Philippines)|National Bureau of Investigation]] (NBI) where NBI clearances now come with a QR code. Many of these applications target [[mobile phone|mobile-phone]] users (via [[mobile tagging]]). Users may receive text, add a vCard contact to their device, open a URL, or compose an [[email#Message format|e-mail]] or text message after scanning QR codes. They can generate and print their own QR codes for others to scan and use by visiting one of several pay or free QR code-generating sites or apps. [[Google]] had an [[API]], now deprecated, to generate QR codes,<ref>{{cite web |date=26 May 2015 |title=Getting Started with Infographics (deprecated) |url=https://google-developers.appspot.com/chart/infographics/docs/overview |url-status=dead |archive-url=https://web.archive.org/web/20160629232058/https://google-developers.appspot.com/chart/infographics/docs/overview |archive-date=29 June 2016 |access-date=27 May 2016 |website=google-developers.appspot.com}}</ref> and apps for scanning QR codes can be found on nearly all smartphone devices.<ref>{{cite web | url=http://www.708media.com/qrcode/qr-code-readers-iphone-android-blackberry-windows-phone-7/ | title=QR Code Readers for iPhone, Android, Blackberry and Windows Phone 7 | url-status=live | archive-url=https://web.archive.org/web/20110825233859/http://www.708media.com/qrcode/qr-code-readers-iphone-android-blackberry-windows-phone-7/ | archive-date=25 August 2011| date=2010-12-07}}</ref>
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