The Bible is the basis for Christian faith. It contains the stories of God and God's people going back a very long time. The stories contained in the Bible establish the relationship that God has with humanity and creation. They contain God's promises that we see God continuing to keep.
The Bible contains two parts: the Hebrew Bible (or Old Testament), and the New Testament. The Hebrew Bible is also the sacred text for the Jewish faith, the religion that Jesus was a part of. Most of it was originally written in Hebrew. The New Testament contains stories of Jesus' birth, life, ministry, death, resurrection, and stories of the early church.
As you look at a Bible, you will see that it is broken down into "books." These books were originally scrolls or letters. Each book is broken down into chapters (big numbers) and verses (small numbers). These numbers were added many years later as more and more people began reading it; they help us all read at the same place. When you see scripture written out like, "John 3:16" that means that you are looking for John, chapter 3, verse 16.