"What does it mean that God is love?"
Let’s look at how the Bible describes love, and then we will see a few ways in which God is the essence of love. “Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres. Love never fails” (1 Corinthians 13:4-8a). This is God's description of love, and because God is love (1 John 4:8), this is what He is like.