Sokovia is a fully fictional country from the Marvel Cinematic universe. It appeared in movies Captain America: The Winter Soldier and Avengers: Age of Ultron. Other mentions in movies Ant-Man (mentioned) and Captain America: Civil War (mentioned and footage).
It is known for Sokovia Accords- a set of internationally ratified legal documents that provide regulation and frame-working for the military/law enforcement deployment of enhanced individuals, particularly the Avengers.
Sokovia inhabitants use a Cyrillic alphabet (similar to Russian)
Sokovia is located somewhere near Czech Republic and Austria.
Slovakia is a real country in Central Eastern Europe with the population of 5 million and the capital city Bratislava.
It is known as a location where the famous Treaty of Pressburg was signed. It happened about 200 years ago during the Napoleon wars.
In Slovakia, the common latin alphabet is used (similar to English), with few special characters, e.g. č,š,ť,ž,ň,ä,ô.
Slovakia is located near Czech Republic and Austria. From Bratislava, you can reach the borders of both these neighbouring countries in less than 20 minutes by car.