• Android: an open-source operating system created by Google
  • G1: the telephone we're using, manufactured by HTC and running the Android operating system
  • Open source software: software that users can modify and freely distribute
  • Operating System: the base software on a computer that determines what types of programs it can run; some operating systems are Windows XP, Macintosh OS X, Linux, and Android
  • Source code: the editable version of a computer program
Feel free to add definitions or to request them in the comments section.