The "Book of Baruch" is a religious text that is part of the Apocrypha, a collection of books that are not included in the Hebrew Bible but are used by some Christian denominations. The Book of Baruch is also referred to as the "Baruch ben Neriah," which means "Blessed is the son of Neriah." Other synonyms for the Book of Baruch include the "Letter of Jeremiah," as it contains a letter that is purportedly written by the prophet Jeremiah, and the "Epistle of Jeremy." The book was likely written in the 2nd century BC and contains various prayers and prophecies related to the Babylonian exile of the Jewish people.