The National Security Agency's (NSA) Web site provides information about NSA's mission and activities. NSA is the nation's cryptologic organization and employs this country's premier codemakers and codebreakers. Under its two national missions, NSA collects and processes foreign signals intelligence and it is also responsible for providing leadership, products and services to protect classified and unclassified national security systems against exploitation or intelligence threats. The NSA homepage contains information about NSA's mission, general facts and figures, and an on-line tour through NSA's National Cryptologic Museum--with a sample of exhibits which chronicle American cryptology.