The soul is the immaterial part of a person from which flow the actions, thoughts, desires, reasoning, etc. It is separate from the physical body. It is the part of the person that makes a person what he is--alive, aware, able, etc. It is the essence of personhood. Biblical theology teaches that the soul is separate from the body and can exist independently of it (2 Corinthians 5:8).
We are to love the Lord our God with our souls (Deuteronomy 6:5, Matthew 22:37). Our souls are alive (1 Samuel 25:26, 1 Corinthians 15:45), can despair (Deuteronomy 28:65), feel pain (Lamentations 3:51), be annoyed (Judges 16:16), grieved (1 Samuel 2:33, Isaiah 19:10), be bitter (Isaiah 38:15), scorn (Ezekiel 36:5), desire (1 Samuel 23:20), hate (2 Samuel 5:8), can love (Song 3:1, 3), be troubled (2 Kings 4:27), can be redeemed (Job 33:28), be dismayed (Psalm 6:3), can hate (Psalm 11:5), can praise (Psalm 30:12), rejoice (Psalm 35:9 7), can desire evil (Proverbs 21:10), be weary (Proverbs 25:25), etc.