The word canon means measuring stick. The Bible has a holy red thread that runs through all the 66 books and describes God's wonderful salvation plan. The Creator saves His beloved humanity through the Jesus the Messiah. The Bible has an "organic unity" and is therefore a book and not just any compilation of books. It is a holy scripture because it is written by prophets, evangelists and apostels, all inspired by the Holy Spirit.
The Apostle Paul says:
All Scripture is God-breathed...
2 Tim 3:16a
The Greek word for "God-breathed" is theopnevstos. This word could also be translated filled by the Spirit of God... All books in the Bible are written by people filled by the Holy Spirit, therefore all books are inspired by the Holy Spirit and breathed through by God Himself.
The Bible is the Word of God, written by people, just like Jesus was God in a human body. The divine and humanity meet in the Bible just like in Jesus. The Word became flesh in Jesus and the Word will also become a reality when you read and take action. Study your Bible like a holy scripture and not just like any other book.