Google AdWords is an online advertising service, developed by Google, where advertisers pay to display brief advertising copy to web users. Google AdWords' system is based partly on cookies and partly on keywords determined by advertisers. Google uses these characteristics to place advertising copy on pages where they think it might be relevant. Advertisers pay when users divert their browsing to click on the advertising copy. Partner websites receive a portion of the generated income.
Google Click-to-Call was a service provided by Google which allowed users to call advertisers straight from Google search results pages. Users entered their phone numbers and Google would connect the call to the advertiser. Google paid for the calling charges. The service was discontinued in 2007. For some time, similar click-to-call functionality was available for results in Google Maps. In the Froyo release of Google's Android operating system, certain advertisements included a very similar functionality. In iOS, phone numbers are automatically recognized as such. Web developers can also provide direct links to the Phone application, providing similar functionality.
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