In the age of the Internet, which now determines daily life for Americans, many threats to the U.S. now exist in the cyber domain. Cybersecurity is a near-constant theme in Washington, as well as for private companies around the country. Congress and government agencies are clamoring to develop policies and strategies to protect national security and commercial interests. Internet attacks are already a standard feature of modern life, and the threats and their implications from hacking into company sites to steal credit card numbers to hacking into government computers for espionage are growing fast. Cybersecurity must be addressed the right way. This Heritage Foundation paper outlines the basic facts of the Internet and the policy principles to which they lead.