Adam and Eve are the parents of all humans in the Abrahamic religions. In the Book of Genesis in the Bible, as well as the Qu'ran and the Aqdas, they are the first two people made by God.
The Bible says that the Nāḥāš (translated as serpent) tempted Eve so she could eat the forbidden fruit of the tree of knowledge of good and evil in the middle of the garden, disobeying God's command. When Adam and Eve sinned, they were cast out of the Garden of Eden and cursed with pain, death, and sickness.
In the Christian religion, the serpent is the Devil, a fallen angel and chief demon, who carries the titles of Lucifer ("Light bringer" or "Shining One") and Satan ("Accuser" or "Adversary").