From Wikipedia:
Slovakia is a landlocked country in Central Europe. Its territory spans about 49,000 square kilometres (19,000 sq mi) and is mostly mountainous. The population is over 5 million and comprises mostly ethnic Slovaks. The capital and largest city is Bratislava. The official language is Slovak.
The end of Communist rule in Czechoslovakia in 1989, during the peaceful Velvet Revolution, was followed by the country's dissolution into two successor states. The word "socialist" was dropped in the names of the two republics, i.e. the Slovak Socialist Republic was renamed the Slovak Republic. In July 17, 1992 Slovakia, led by Prime Minister Vladimír Mečiar, declared itself a sovereign state, meaning that its laws took precedence over those of the federal government. Throughout the autumn of 1992, Mečiar and Czech Prime Minister Václav Klaus negotiated the details for disbanding the federation. In November the federal parliament voted to dissolve the country officially on December 31, 1992.
The Slovak Republic and the Czech Republic went their separate ways after 1 January 1993, an event sometimes called the Velvet Divorce. Slovakia has remained a close partner with the Czech Republic. Both countries co-operate with Hungary and Poland in the Visegrád Group.