To the suggestion that Chrome OS -- the operating system that Google is developing around its Chrome browser -- is on a collision course with Windows, Pichai responded that the world is entering a period of tremendous innovation in personal computing. "Browsers are suddenly hot again and I think operating systems are too," he said, referring both to Chrome OS and Android, Google's operating system for mobile devices "There haven't been other choices for a long time," he said. "Most operating systems today were designed before the Web existed." "The goal with both our efforts is to get great free open source software stacks out there," he said. In the case of Chrome OS, everything is built around the browser."