This is the big question: Who is the Holy Spirit and what does He do? Hold on---He? Yes, He is a person just like God the Father and God the Son. God the Holy Spirit plays an important role in the trinity of our God.
He is our Advocate. When Jesus ascended to Heaven, He didn't leave us alone. He gave us the gift of the Holy Spirit who lives inside of all believers. Holy Spirit speaks to us about God's will for our lives, He gives us revelation to the Word of God, and He helps keep us on the path of righteousness. Look at Him as your Best Friend from God. He is always with you!