
1969
ARPA goes online in December, connecting four major U.S. universities.

1972
Electronic mail is introduced by Ray Tomlinson, a Cambridge, Mass.

1976
Jimmy Carter and Walter Mondale use email to plan campaign events. Queen Elizabeth sends her first email.

1982
The word “Internet” is used for the first time.

1984
Domain Name System is established, with network addresses identified by extensions such as .com, .org, and .edu.

1988
A virus called the Internet Worm temporarily shuts down about 10% of the world's Internet servers.

1990
The first effort to index the Internet is created by Peter Deutsch at McGill University.

1991
Gopher, which provides point-and-click navigation, is created at the University of Minnesota and named after the school mascot.

1998
Google opens its first office, in California.

2005
YouTube.com is launched.