"Apologetics is that branch of Christian theology which seeks to provide a rational justification for the truth claims of the Christian faith."
William Lane Craig
Apologetics can help both believers and unbelievers. For Christians, apologetics can help us confirm that the faith is true. But the Holy Spirit can also use apologetics to help unbelievers discover that Christianity is true.
1 Peter 3:15 but in your hearts honor Christ the Lord as holy, always being prepared to make a defense to anyone who asks you for a reason for the hope that is in you; yet do it with gentleness and respect,
Colossians 4:6 Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone.
2 Timothy 2:25 Those who oppose him he must gently instruct, in the hope that God will grant them repentance leading them to a knowledge of the truth,
1 Peter 1:3 Praise be to the God and Father of our Lord Jesus Christ! In his great mercy he has given us new birth into a living hope through the resurrection of Jesus Christ from the dead,