There is only one true and living God who is three beings, or persons. The perfect unity between the three persons of God make a single entity. The plural nature of God is asserted in the opening chapter of the Bible. This may sound like a contradiction, but it is not. Space is limitless, having no bounds.
Space has three measurements.
Look at a cube. Height, length, thickness each is separate and identifiable and are the dimensions of space. In much the same way, there are three distinguishable beings in one God. Each possess the God nature and besides this one God with three beings there is none other. God alone is God.