According to 1 Corinthians 13 – Love is patient and is kind; love doesn’t envy. Love doesn’t brag, is not proud, doesn’t behave itself inappropriately, doesn’t seek its own way, is not provoked, takes no account of evil; doesn’t rejoice in unrighteousness, but rejoices with the truth; bears all things, believes all things, hopes all things, endures all things. Love never fails.
I can’t think of a better definition.
Read more about love, the love of God through Jesus Christ in the Holy Bible. A great place to start is in what is commonly referred to as the love chapter, 1 Corinthians 13.