The term "Codex" refers to an ancient manuscript in book form, typically made of parchment or paper. Codices were used in the past to compile texts, such as religious scriptures, literary works, or legal documents. They often replaced scrolls due to their more convenient format, allowing for easier reading and referencing. One of the most famous examples of a codex is the Codex Gigas, also known as the "Devil's Bible," which is a large medieval manuscript containing the entire Bible along with other texts. Codices played a significant role in the preservation and dissemination of knowledge throughout history.