The Cyrillic script is an alphabetic writing system used for various languages across Eastern Europe and Central Asia. It was developed in the 9th century and is named after the Byzantine brothers Saints Cyril and Methodius, who created the first Slavic alphabet. Today, it is used by languages such as Russian, Bulgarian, and Serbian. Cyrillic has undergone several reforms and adaptations over the centuries, leading to different versions of the script. Its letters are distinct and can vary in shape depending on the language, but it remains a vital part of the cultural identity for many Slavic nations.