Christian Apologetics is when objective reasoning and evidence is used to prove to unbelievers that beyond reasonable doubt Christianity is true and communicating that truth to the world.
Here is a great resource for Christian Apologetics:
Books to Read:
– Tactics (by Gregory Koukl)
– I Don’t Have Enough FAITH to Be an ATHEIST (by Frank Turek & Norman L. Geisler)
– COLD- CASE CHRISTIANITY (by J. Warner Wallace)