Country codes are short alphabetic or numeric geographical codes (geocodes) developed to represent countries and dependent areas, for use in data processing and communications.
A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code.
Czechoslovakia, or Czecho-Slovakia (Czech and Československo, Česko-Slovensko), was a sovereign state in Central Europe that existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the:Czech Republic and:Slovakia on 1 January 1993.
Slovakia (Slovensko), officially the Slovak Republic (Slovenská republika), is a landlocked country in Central Europe.
A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet.
.cs was for several years the country code top-level domain (ccTLD) for Czechoslovakia.