The Holy Spirit is a fundamental part of the Christian concept of God, often seen as the Spirit of God, a divine presence that's with believers. In Christianity, the Holy Spirit is considered the third person of the Trinity, alongside God the Father and Jesus Christ the Son.

The Holy Spirit is often described as:
- A comforter, helper, or advocate (John 14:16-17)
- A teacher and guide (John 16:13)
- A source of power and strength (Acts 1:8)
- A symbol of God's presence and love (Romans 5:5)