The Arabic script is written from right to left in a cursive style. In most cases, the letters transcribe consonants, or consonants and a few vowels, so most Arabic alphabets are abjads.
The script was first used to write texts in Arabic, most notably the Qurʼān, the holy book of Islam. With the spread of Islam, it came to be used to write languages of many language families, leading to the addition of new letters and other symbols, with some versions, such as Kurdish, Uyghur, and old Bosnian being abugidas or true alphabets. It is also the basis for the tradition of Arabic calligraphy.