<P> On certain occasions, the logo on Google's webpage will change to a special version, known as a "Google Doodle". This is a picture, drawing, animation or interactive game that includes the logo . It is usually done for a special event or day although not all of them are well known . Clicking on the Doodle links to a string of Google search results about the topic . The first was a reference to the Burning Man Festival in 1998, and others have been produced for the birthdays of notable people like Albert Einstein, historical events like the interlocking Lego block's 50th anniversary and holidays like Valentine's Day . Some Google Doodles have interactivity beyond a simple search, such as the famous "Google Pacman" version that appeared on May 21, 2010 . </P> <P> During Google's developer conference in May 2013, the company announced that, on Google Chrome and Chrome OS, users would be able to say "OK Google", with the browser initiating an audio - based search, with no button presses required . After having the answer presented, users can follow up with additional, contextual questions; an example include initially asking "OK Google, will it be sunny in Santa Cruz this weekend?", hearing a spoken answer, and reply with "how far is it from here?" An update to the Chrome browser with voice - search functionality rolled out a week later, though it required a button press on a microphone icon rather than "OK Google" voice activation . Google released a browser extension for the Chrome browser, named with a "beta" tag for unfinished development, shortly thereafter . In May 2014, the company officially added "OK Google" into the browser itself, though the company removed it in October 2015, citing low usage, though the microphone icon for activation remained available . In May 2016, 20% of search queries on mobile devices were done through voice . </P> <P> In May 2017, Google enabled a new "Personal" tab in Google Search, letting users search for content in their Google accounts' various services, including email messages from Gmail and photos from Google Photos . </P> <P> In June 2017, Google expanded its search results to cover available job listings . The data is aggregated from various major job boards and collected by analyzing company homepages . Initially only available in English, the feature aims to simplify finding jobs suitable for each user . </P>

Which type of search is not available in google