The Kingdom of God is the realm where God reigns supreme, and Jesus Christ is King. God's authority is recognized and His will is obeyed.  Sometimes the Bible refers to the Kingdom of God as a present reality and other times a future realm or territory.  The Kingdom of God is something that Jesus said is at hand.  It's something you can belong to; it's within you; the unrighteous will not inherit it; it's something no one can see unless he is born again.  David refers to it as ... for all that's in heaven or the earth is yours.  In that sense all of us, whether we like it or not, live in the Kingdom of God.