What does "gift" mean?

In Romans 6:23 it says "For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord." The Greek word that Paul used that is translated 'gift' is the word 'charisma.' The root form of that word is 'charis' which is usually translated 'grace.' Grace is when you are given something good that you don't deserve, which is precisely what a gift is. God grants us eternal life through no effort of our own. There is nothing we can do to earn it. All we have to do is trust Jesus.