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), can desire evil (Proverbs 21:10), be weary (Proverbs 25:25), etc.