What does arius mean that Jesus is not eternal or co eternal?

Arianism, a theological belief attributed to Arius, posits that Jesus Christ is not eternal or co-eternal with God the Father. According to this view, Jesus was created by God and therefore had a beginning, distinguishing him from God, who is uncreated and eternal. This doctrine was deemed heretical by the early Christian church, leading to the formulation of the Nicene Creed, which affirms the co-eternity and consubstantiality of the Son with the Father.