Apple, Google, and Microsoft are all among the Top Biggest Tech Companies in the World. However, they are not the only tech giants on the list. Amazon is the leader in cloud service providers and has dominated the AI-based personal assistant market, while Google controls only about a quarter of that market. Google and Alphabet dominate web-based services, such as search, video sharing, and mapping and navigation. Facebook is the top player in social networking and shares leadership with Google in the digital advertising market. Apple, however, is the leading player in computing devices. Microsoft, on the other hand, is the leader in the operating system and productivity software markets. Moreover, Microsoft is one of the biggest companies in the game industry and has been a leader for years.