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[[File:QR code for mobile English Wikipedia.svg|thumb|A QR code for the [[URL]] of the [[English Wikipedia]] Mobile main page|alt=A QR code for the URL of the English Wikipedia Mobile main page]]
A '''QR code,''' short for '''quick-response code''',<ref>{{cite interview |last=Hara |first=Masahiro |subject-link=Masahiro Hara |interviewer-last=Muller |interviewer-first=Derek
Whereas a barcode is a machine-readable optical image that contains information specific to the labeled item, the QR code contains the data for a locator, an identifier, and web-tracking. To store data efficiently, QR codes use four standardized modes of encoding: [[Number|numeric]], [[Alphanumericals|alphanumeric]], [[Byte pair encoding|byte]] or [[Binary number|binary]], and [[kanji]].<ref name="QRCodefeatures">{{cite web |url=http://www.qrcode.com/en/qrfeature.html |title=QR Code features |publisher=Denso-Wave |access-date=3 October 2011 |archive-url=https://web.archive.org/web/20130129064920/http://www.qrcode.com/en/qrfeature.html |archive-date=2013-01-29}}</ref>
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In 2015, the [[Central Bank of Russia|Central Bank of the Russian Federation]] issued a 100-[[ruble]]s note to commemorate the [[annexation of Crimea by the Russian Federation]].<ref>{{Cite web |date=December 23, 2015 |title=Russia Marks Crimea Annexation With A Banknote Rapidly Losing Value |url=https://www.npr.org/sections/parallels/2015/12/23/460831232/russia-marks-crimea-annexation-with-a-banknote-rapidly-losing-value |url-status=live |archive-url=https://web.archive.org/web/20151223201150/https://www.npr.org/sections/parallels/2015/12/23/460831232/russia-marks-crimea-annexation-with-a-banknote-rapidly-losing-value |archive-date=December 23, 2015 |access-date=June 20, 2024 |publisher=NPR}}</ref> It contains a QR code into its design, and when scanned with an internet-enabled mobile device, the code goes to a website that details the historical and technical background of the commemorative note. In 2017, the [[Bank of Ghana]] issued a 5-[[Ghanaian cedi|cedis]] banknote to commemorate 60 years of [[central bank]]ing in [[Ghana]]. It contains a QR code in its design which, when scanned with an internet-enabled mobile device, goes to the official Bank of Ghana website.
=== Augmented reality ===
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=== Joining a Wi‑Fi network ===
[[File:QR code Wi-Fi generic.svg|thumb|upright|A QR code to automatically join a Wi‑Fi network]]
By specifying the SSID, encryption type, password/passphrase, and if the SSID is hidden or not, mobile device users can quickly scan and join networks without having to manually enter the data.<ref>{{cite web|title=Share your Wi-Fi SSID & Password using a QR Code|url=http://www.technostarry.com/share-wi-fi-details-using-qr-code/|date=2015-07-19|access-date=6 January 2018|archive-date=12 January 2023|archive-url=https://web.archive.org/web/20230112193217/http://www.technostarry.com/share-wi-fi-details-using-qr-code/|url-status=live|author-first1=Mrinmay|author-last1=Bhattacharjee|website=Technostarry}}</ref> A [[MeCard (QR code)|MeCard]]-like format is supported by Android and iOS 11+.<ref>{{cite web |title=zxing documentation: barcode contents |url=https://github.com/zxing/zxing/wiki/Barcode-Contents |website=GitHub |publisher=zxing |access-date=26 May 2016 |archive-date=15 February 2016 |archive-url=https://web.archive.org/web/20160215201205/https://github.com/zxing/zxing/wiki/Barcode-Contents |url-status=live}}</ref>
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=== Secure QR code{{anchor|SQR}} ===
Secure Quick Response Code (
=== Frame QR ===
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The text ''QR Code'' itself is a [[registered trademark]] and [[wordmark]] of Denso Wave Incorporated.<ref name="qrtrademark01">{{cite web |url=http://www.qrcode.com/en/index.html |title=QR Code.com |publisher=Denso-Wave |date=6 November 2003 |access-date=23 April 2009 |archive-url=https://archive.today/20120915/http://www.qrcode.com/en/index.html |archive-date=2012-09-15}}</ref> In UK, the trademark is registered as E921775, the term ''QR Code'', with a filing date of 3 September 1998.<ref name="qrtrademarkuk">{{cite web |url=http://www.ipo.gov.uk/types/tm/t-os/t-find/t-find-number?detailsrequested=C&trademark=E921775 |title=UK QR Code Trademark |archive-url=https://archive.today/20120915/http://www.ipo.gov.uk/types/tm/t-os/t-find/t-find-number?detailsrequested=C&trademark=E921775 |archive-date=2012-09-15}}</ref> The UK version of the trademark is based on the Kabushiki Kaisha Denso (DENSO CORPORATION) trademark, filed as Trademark 000921775, the term ''QR Code'', on 3 September 1998 and registered on 16 December 1999 with the European Union OHIM (Office for Harmonization in the Internal Market).<ref name="qrtrademarkeu">{{cite web |url=http://esearch.oami.europa.eu/copla/trademark/data/000921775 |title=EU QR Code Trademark |archive-url=https://archive.today/20120915/http://esearch.oami.europa.eu/copla/trademark/data/000921775 |archive-date=2012-09-15}}</ref>
The U.S. Trademark for the term ''QR Code'' is Trademark 2435991 and was filed on 29 September 1998 with an amended registration date of 13 March 2001, assigned to Denso Corporation.<ref name="qrtrademarkus">{{cite web |url=http://tess2.uspto.gov/bin/showfield?f=doc&state=4010:nrb6eh.2.6 |title=US QR Code Trademark |archive-url=https://archive.today/20120915/http://tess2.uspto.gov/bin/showfield?f=doc&state=4010:nrb6eh.2.6 |archive-date=2012-09-15}}</ref> In South Korea, trademark application filed on 18 November 2011 was refused
== Risks ==
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