Trinitarians are Christians who believe in the doctrine of the Trinity, which teaches that God exists as three distinct persons: God the Father, God the Son (Jesus Christ), and God the Holy Spirit. These three persons are co-equal and co-eternal, meaning they have always existed together and share the same divine essence. This belief is rooted in the Bible, particularly in passages like Matthew 28:19 and 2 Corinthians 13:14, which reference all three persons of the Trinity. Trinitarians emphasize that while each person is unique, they are united in purpose and nature, forming one God in three persons.