advertiser to pay money to Google unduly. Industry reports in 2006 claimed that approximately 14 to 20 percent of clicks were fraudulent or invalid. Google Search Console (rebranded from Google Webmaster Tools in May 2015) allows webmasters to check the sitemap, crawl rate, and for security issues of their websites, as well as optimize their website's visibility. Consumer services Web-based services Google offers Gmail for email, Google Calendar for time-management and scheduling, Google Maps for mapping, navigation and satellite imagery, Google Drive for cloud storage of files, Google Docs, Sheets and Slides for productivity, Google Photos for photo storage and sharing, Google Keep for note-taking, Google Translate for language translation, YouTube for video viewing and sharing, Google My Business for managing public business information, and Duo for social interaction. In March 2019, Google unveiled a cloud gaming service named Stadia. A job search product has also existed since before 2017, Google for Jobs is an enhanced search feature that aggregates listings from job boards and career sites. Some Google services are not web-based. Google Earth, launched in 2005, allowed users to see high-definition satellite pictures from all over the world for free through a client software downloaded to their computers. Software Google develops the Android mobile operating system, as well as its smartwatch, television, car, and Internet of things-enabled smart devices variations. It also develops the Google Chrome web browser, and ChromeOS, an operating system based on Chrome. Hardware In January 2010, Google released Nexus One, the first Android phone under its own brand. It spawned a number of phones and tablets under the "Nexus" branding until its eventual discontinuation in 2016, replaced by a new brand called Pixel. In 2011, the Chromebook was introduced, which runs on ChromeOS. In July 2013, Google introduced the Chromecast dongle, which allows users to stream content from their smartphones to televisions. In June 2014, Google announced Google Cardboard, a simple cardboard viewer that lets the user place their smartphone in a special front compartment to view virtual reality (VR) media. Other hardware products include: Nest, a series of voice assistant smart speakers that can answer voice queries, play music, find information from apps (calendar, weather etc.), and control third-party smart home appliances (users can tell it to turn on the lights, for example). The Google Nest line includes the original Google Home (later succeeded by the Nest Audio), the Google Home Mini (later