He is a beautiful third person in the Trinity of Father, Son and the Holy Spirit. He is a conduit that we are blessed with.
"May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all."
2 Corinthians 13:14
The Holy Spirit is a real person who came to reside within Jesus during his mission on earth and also within Christ’s true followers after Jesus rose from the dead and ascended to heaven. When one becomes a Christian by believing and receiving Jesus Christ, God resides in that person through the Holy Spirit. He actually lives inside of you and will never leave you. He is your Counsellor, Helper, Intercessor, Advocate, Strengthener and Standby.
Jesus said, "And I will ask the Father, and He will give you another Comforter (Counsellor, Helper, Intercessor, Advocate, Strengthener, and Standby), that He may remain with you forever—
The Spirit of Truth, Whom the world cannot receive (welcome, take to its heart), because it does not see Him or know and recognize Him. But you know and recognize Him, for He lives with you [constantly] and will be in you."
John 14:16-17 (AMPC)
The Holy Spirit opens the eyes of a believer’s heart to know God better, helps strengthens them and fills them with the fullness of God. He is God living in us!