Seth, in the Abrahamic religions, was the third son of Adam and Eve. According to the Hebrew Bible, he had two brothers: Cain and Abel. According to Genesis 4:25, Seth was born after Abel's murder by Cain, and Eve believed that God had appointed him as a replacement for Abel.
Fresco of "Forefather Sif" (1378), by Theophanes the Greek, in the Church of the Transfiguration of the Savior in Novgorod.
The purported grave of Seth in a village of the same name in the Levant
The purported grave of Seth in Bashshit, modern-day Israel
Adam is the name given in Genesis 1-5 to the first human. Adam is the first human-being aware of God, and features as such in various belief systems.
Detail from Michelangelo's The Creation of Adam, Sistine Chapel ceiling
A Byzantine mosaic in Monreale depicting Adam encountering the pre-incarnate Jesus at the Garden of Eden
And Elohim Created Adam, William Blake
God Judging Adam, William Blake, 1795