Transliteration is how writing is changed from a writing system or alphabet to another, while making each sound stay the same. There are different systems of writing in the world. Some use letters to write out sounds, and others use characters to write out whole words that have many sounds in them. Transliteration is what happens when letters from an alphabet match letters of another alphabet, that have the same sounds. Most often this is done by spelling the sounds of one system, with the letters or symbols of another. For example, the Cyrillic letter я is usually written as ya.