Cyrillic is a kind of alphabet used in Russia, Ukraine, Belarus, Bulgaria, and Serbia. While the Western church was based in Rome (which used the Latin alphabet we see on this page), these countries were Christianized from Constantinople, which spoke Greek. St. Cyrill was the man who adapted the Greek alphabet for Eastern Europe. For a long time education meant reading the Bible, so even when European culture became more secular, the same alphabet tended to be used as in the local Bible translation.