The Hebrew Bible, also called the Tanakh / תַּנַ״ךְ, or Mikra, is the canonical collection of Jewish texts, which is also the textual source for the Christian Old Testament. These texts are composed mainly in Biblical Hebrew, with some passages in Biblical Aramaic (in the books of Daniel, Ezra and a few others). It is divided into 24 books, while the Protestant Bible translations divide the same material into 39 books.
The terms “Bible” and “Old Testament” are commonly used by non-Jews to describe Scriptures, the appropriate term is “Tanakh”.
Tanakh is an acronym of the first Hebrew letter of each of the Masoretic Text’s three traditional subdivisions: Torah (‘Teaching’, also known as the Five Books of Moses), Nevi’im (’Prophets’) and Ketuvim (’Writings’)—hence TaNaKh.