The text of the Qur’an consists of 114 chapters of varying lengths, each known as a sura. Chapters are classed as Meccan or Medinan, depending on where the verses were revealed. Chapter titles are derived from a name or quality discussed in the text, or from the first letters or words of the sura. Generally, longer chapters appear earlier in the Qur’an, while the shorter ones appear later. The chapter arrangement is thus not connected to the sequence of revelation. Each sura except the ninth commences with the Basmala, an Arabic phrase meaning (“In the name of God, Most Gracious, Most Merciful”). There are, however, still 114 occurrences of the basmala in the Qur’an, due to its presence in verse 27:30 as the opening of Solomon's letter to the Queen of Sheba.
Each sura is formed from several ayat (verses), which originally means a sign or portent sent by God. The number of ayat differ from sura to sura. An individual ayah may be just a few letters or several lines.
There is a crosscutting division into 30 parts, ajza.
A recitation of a Qur'an chapter (18) called 'The Cave' - including English translation: