Codex Vaticanus is one of the oldest and most important manuscripts of the Bible. It dates back to the early 4th century and is written in Greek. Housed in the Vatican Library, it contains the entire Old Testament and most of the New Testament, making it a crucial resource for biblical scholars. The manuscript is notable for its elegant script and the absence of later additions or corrections, which helps preserve its original text. Codex Vaticanus is often compared to another ancient manuscript, Codex Sinaiticus, as both provide valuable insights into early Christian texts and the development of the Christian canon.