“The third day he rose again from the dead; he ascended into heaven, and sits at the right hand of God the Father Almighty.” What is the meaning of the 5th and 6th articles of the Apostles’ Creed?

“[Jesus] suffered under Pontius Pilate; was crucified, dead, and buried; he descended into hell.” What is the meaning of the fourth article of the Apostles’ Creed?