The word "Trinity" means three. Our one true God is three person in one. Our God is father, son (Jesus), and Holy Spirit. All of them are God.
There was one time when all three were in the same place at the same time. The Bible tells us that when Jesus was baptized (the Son), the sky opened and a dove appeared (the Holy Spirit). Then a voice came from heaven saying, "this is my Son in whom I am well pleased" (the Father). All three parts of the trinity in one place! All of them God!