Fatha is a diacritical mark used in the Arabic script. It appears as a small diagonal line placed above a letter and indicates a short vowel sound, specifically the "a" sound. This mark is essential for proper pronunciation and understanding of Arabic words, as Arabic is primarily a consonantal language. In addition to Fatha, there are other diacritical marks in Arabic, such as Damma and Kasra, which represent different vowel sounds. These marks help learners and speakers of Arabic read and pronounce words accurately, making them crucial for both written and spoken communication in the language.