What is the Kingdom of God?

I woke up this morning thinking about the question my friend asked me: “What is the kingdom of God?” Then, I looked at Luke 17:20-21: “The kingdom of God does not come with observation…. For indeed the kingdom of God is within you.” I believe that the kingdom of God is the kingdom that exists and operates through the common faith of believers in Jesus Christ that He is God who loves us and gives us eternal life.