The Blessed Trinity is a supernatural mystery. This means that we will never be able to fully understand it on earth.
So what is the Blessed Trinity?
The Blessed Trinity is three divine persons in one God.
These three divine persons are the Father, the Son and the Holy Ghost. They are all three separate persons, but also one divine God. This is what we will never fully be able to understand.
God the Father we know best as the person who made the world. He is our creator.
God the Son is Jesus Christ. He came down to earth to save us from our sins and give us the right to go to heaven.
God the Holy Ghost is often pictured as a dove. It is Him who comes to us in the Sacrament of Confirmation and helps us to stay strong and holy Catholics.
Whenever we say the Sign of the Cross we are actually saying a prayer to the Blessed Trinity