The TANAK, Hebrew Books of Scripture
The Hebrew Bible is divided into three portions:
1. Torah, also referred to as the "Chumash" or Five after the first five books:
Bereshit - Genesis
Shemot - Exodus
Vayikra - Leviticus
Bamidbar - Numbers
Devarim - Deuteronomy
These five books were written by Moses. In English they are called the Pentateuch.
2. Neviim -The Prophets (Prophets and History).
Twelve (Minor i.e., smaller) Prophets in Hebrew "Trei Eser" (meaning "Twelve") sometimes considered one book: In the Synagogue all 12 were often written on one scroll.
3. Ketuvim (Writings)
Five Megillot (Five Scrolls): Song of Songs (Shir HaShirim), Ruth (Root), Lamentations (Eicah), Ecclesiastes (Kohelet), Esther (Ester)
Ezra and Nehemiah (Ezra ve-Nechamiah),
Chronicles (Divrei Ha-Yamim).
3. Ketuvim - The Writings (Wisdom Books).
These three sections (1) Torah, (2) Neviim, (3) Ketuviim, give us the acronym TANAK. That is why in Hebrew the Written Bible is called "Tanak."