Open source refers to software that is free to use, modify, and share. It encourages collaboration as people share what they know through open communication and cooperation. Major technologies like Linux, Android, and Apache web server started as open source projects. Open data takes the open source principles and applies them to data by making content freely available for anyone to use and reuse, subject only to attribution requirements. Open data can accelerate the rate of discovery and better support communal activities by improving access to information.