Biblical canon

The Bible is a collection of texts. These texts are usually called "books". There are different versions of the Bible. These versions come from communities that include parts they find important and leave out other parts they think are less important. A Biblical canon is a set of books of the Bible that a certain movement considers Scripture (that is, inspired by God).
Books.
These books are in almost all Christian Bibles. Some Bibles contain other books as well.
Old Testament.
These books were written before the birth of Jesus Christ.
New Testament.
These books were written after the birth of Jesus Christ.