Apologetics is simply a fancy name for the defense of Christianity. While apologetics truly can be the arguments in favor or in defense of any theory or institution, Christian apologetics is a learned skill that deals with answering questions about the veracity or truth of the Gospel. These questions may be from just inquiring individuals or from the more vocal critics who oppose or question the truth of the Gospel account, the historical evidence for the Bible, and the revelation of God.
While there are very serious scholars in the specialized field of Apologetics, every Christian has a role to play as every Christian should be 'ready.' As the Apostle Peter gave us the charge, "But sanctify Christ as Lord in your hearts, always being ready to make a defense to everyone who asks you to give an account for the hope that is in you, yet with gentleness and reverence," (1 Peter 3:15).
While Apologetics is serious, it doesn't have to be overly complicated or difficult. Note that Jesus chose only one university-educated, overtly religious person, Paul, to be an apostle. The rest were all very common people including fishermen, a tax collector, and a doctor. Like you and me, they were normal people who were chosen because of their availability, rather than their ability. All were used by God because they were not only willing vessels but they were willing to learn. These men (and women too) were all filled with the Holy Spirit. This is the most important and essential element in Christian apologetics, to be willing to do the work but rely at the same time completely on the grace, the mercy and the Power of God to change hearts and minds and ultimately souls for eternity.
The Lord has called every Christian to be ready to make a defense of his faith. Often this means that we give a reason for the hope we have, the reason for our faith. While there are many that have a Ph.D and have specialized training, all of us can give our testimony, all of us should be willing to answer questions about why and what we believe. If you feel inadequate, join the club! All of us can learn from others that have already reasoned and come up with adequate answers. We don't need to fear the "gotcha' questions as we have a reasonable, historical and documented faith. The Bible is and continues to be one of the most researched and respected books of antiquity. It has stood the test of time and can withstand all challenges. The truth contained in the scriptures is exactly that.....truth! It has and will always survive the sharpest criticism as well as the foolish challenges.