Christian apologetics means defending the Christian faith. This defense can come from Scriptural sources, or it can come from sources outside the Bible, such as archaeology. If a Christian has a strong defense of his faith, a non-Christian will have a difficult (if not impossible) time destroying the Christian's faith. Also, being able to defend the faith can often help to make evangelism efforts more successful (see my page on evangelizing the lost).
Christian Apologetics: Why You Believe what You Believe
But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear: (1 Peter 3:15)
Christian apologetics, or defending the Christian faith, is important. After all, a faith that is not deep rooted is a faith that is easily uprooted.
The Bible consists of 66 books written by 40 authors from kings (David and Solomon) to military leaders (Joshua) to doctors (Luke) to tax collectors (Matthew) to fishermen (Peter) to prophets (many), etc. (in other words, people from all walks of life). We do not have contradictions that cannot be explained (for example, copying or translation errors; remember that, when the Bible was written, they did not have printing presses, Xerox machines, fax, or internet!)
I have some pages here from the header Truth of Scripture to look at and will add more. This can help with external evidence that the Bible is true.
 All scripture references are from the King James Version unless otherwise noted. Please see my about page for why I chose this translation.