The computer's ancestors were machines that performed mathematical calculations.
By the 1970s, personal computers using packaged software were on the market.
The Internet is a network of computer networks. It was started by the U.S. Department of Defense and in its early years was used primarily by scientists. The current Internet started in the 1980s thanks to the efforts of the National Science Foundation.
The main features of the Internet are e-mail, the World Wide Web, and apps.
The introduction of broadband Internet connections has encouraged the growth of streaming video and microcasting.
The Internet has had a beneficial impact on the national economy, and e-commerce continues to grow.
Social media have become important sources of news and entertainment.
Social media can mobilize political movements.
The Internet has created social concerns about lack of gatekeepers, information overload, lack of privacy, and isolation.
