Altho the term is not in the Bible, Trinity is richly taught in the Bible. Trinity is a historical reality as expressed in God the Father, the Son and the Holy Spirit. The omnipresent and omnipotent God chose to express Himself simultaneously in three persons (three realities): the Father in heaven, the Son on earth as Word become fresh, and the Holy Spirit descended on Jesus as he was baptized by John the Baptist. The three persons consulted each other in Creation, The Son took part in creation but the Father provides providence. While the Holy Spirit lives in believers' hearts and protects the church. Trinity is a mystery our human mind finds it difficult to grasp. But it is NOT impossible to understand.