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At their simplest, QR codes (the letters standing for 'Quick Response') are two-dimensional bar codes, i.e. a grid of black and white squares representing a pattern of bits of data.Google released the Penguin update a couple weeks ago, in an effort to rid its search engine results of webspam. The update targeted the kinds of things Google has always tried to rid its results of, but the update is ?URLs - Uniform Resource Locators - Yahoo! News Search Results