The Bible (from Koine Greek τὰ βιβλία, tà biblía, "the books") is a collection of sacred texts or scriptures that Jews and Christians consider to be a product of divine inspiration and a record of the relationship between God and humans. With estimated total sales of over 5 billion copies, it is widely considered to be the most influential and best-selling book of all time.Many different authors contributed to the Bible. What is regarded as canonical text differs depending on traditions and groups; a number of Bible canons have evolved, with overlapping and diverging contents. The Christian Old Testament overlaps with the Hebrew Bible and the Greek Septuagint; the Hebrew Bible is known in Judaism as the Tanakh. The New Testament is a collection of writings by early Christians, believed to be mostly Jewish disciples of Christ, written in first-century Koine Greek. These early Christian Greek writings consist of Gospels, letters, and apocalyptic writings. Among Christian denominations there is some disagreement about the contents of the canon, primarily the Apocrypha, a list of works that are regarded with varying levels of respect.