Alphabet known as Google is a multinational company focusing on Internet-related services and products. The core of Google is its search engine, but the company's portfolio comprises various other Internet-based products such as cloud computing, software, a mobile operating system (Android), online advertising technologies, maps, and YouTube. In August 2015, Google was restructured to become a subsidiary of Alphabet, a holding company and conglomerate. Alphabet has become the parent company for other businesses which formerly were part of Google such as Google Ventures or Calico. Google retains its function as the umbrella company for all the Internet-related businesses.