In various religions, most notably mainstream Christianity, the Holy Spirit (also called the Holy Ghost) is the third consubstantial Person of the Holy Trinity. As such, the various Christian perspectives view the Holy Spirit as God himself or the Breath of God, a form of God, or a manifestation of God. In Christianity, following the New Testament, the Holy Spirit is the One who guides a person to correctly interpret the word of God and He helps each person reach new levels of understanding. Since He knows each person perfectly and it is understood that people think differently, He can transfer information to people in ways that they would comprehend it (Acts of the Apostles 2:7). The Holy Spirit is the Spirit of the Eternal God and the unity of the Divine Trinity.

If your refering to the Christian God... It is part of the Holy Trinity... According to Acts 2:1-47 it is the power the Christian church recieved from Jesus in order to duplicate the Miracles & abilities he had for all his followers...

The Holy Spirit is the third Person of the Godhead. He is God in the Person of the Holy Ghost. Thank you and God bless you!

That depends on who you ask. And since you asked on here I will answer what I believe. The Holy Spirit is one of the three person's of the eternal triune God. Although his full power was not revealed to God's people until the ministry of Jesus and later at Pentecost(Act 2), there are Old Testament passages that refer to him and his work. The Hebrew word for "Spirit" is ruah, a word that is sometimes translated as "wind" and "breath." Thus, the OT references to the breath of God or a wind from God (e.g., Ge 2:7; Eze 37:9-10,14) can also refer to the work of God's Spirit. Many Christians have no idea what a difference it would make if there were no Holy Spirit in this world. Without the Holy Spirit there would be no creation, no universe, no human race (Ge 1:2; Job 33:4). Without the Holy Spirit there would be no Bible (2Pe 1:21), no New Testament (Jn 14: 26; 15:26-27; 1Co 2:10-14), no power to proclaim the gospel (Ac 1:8). Without the Holy Spirit there would be no faith, no new birth, no holiness, no Christians at all in the world. Throughout Scripture the Spirit is revealed as a person with an individuality all his own (2Co 3:17-18; Heb 9:14; 1Pe 1:2). He is a divine person like the Father and the Son. Thus we may never think of the Holy Spirit as a mere influence or power. He has personal characteristics, for he thinks (Ro 8:27), feels (Ro 15:30), wills (1Co 12:11), and has the capacity to love and enjou fellowship of Jesus (Jn 14:16-18,26). In the light of these truths we should treat him as a person and regard him as the infinite living God within our hearts, worthy of worship, love and surrender.

In Orthodox Christianity, the question is "Who is"? He is the third person in the Trinity. He has specific roles, and some roles that overplap with the other two members of the Trinity. Jesus talks a bit about Him in John's Gospel chapter 14: 15"If you love me, you will obey what I command. 16And I will ask the Father, and he will give you another Counselor to be with you forever— 17the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you. 18I will not leave you as orphans; I will come to you. ========= So the Spirit is someone who will be as close to the believers as Jesus was when He was on earth. He will be a "paracletos", here translated as "counsellor", but also translatable as "comforter", "helper", "encourager", "strengthener". He will live with them and in them, so close will he be. ========== In the next Chapter, Jesus talks again of the Holy spirit, this time in terms of a "witness" or "testifier" to who Jesus is and what he did. 26"When the Counselor comes, whom I will send to you from the Father, the Spirit of truth who goes out from the Father, he will testify about me. 27And you also must testify, for you have been with me from the beginning." Once again, the Holy Spirit will be with the disciples as they, too, become "witnesses" or "testifiers" to Jesus. =========== In Chapter 16, Jesus speaks for a third time about the Holy Spirit and his role. 5"Now I am going to him who sent me, yet none of you asks me, 'Where are you going?' 6Because I have said these things, you are filled with grief. 7But I tell you the truth: It is for your good that I am going away. Unless I go away, the Counselor will not come to you; but if I go, I will send him to you. 8When he comes, he will convict the world of guilt in regard to sin and righteousness and judgment: 9in regard to sin, because men do not believe in me; 10in regard to righteousness, because I am going to the Father, where you can see me no longer; 11and in regard to judgment, because the prince of this world now stands condemned. 12"I have much more to say to you, more than you can now bear. 13But when he, the Spirit of truth, comes, he will guide you into all truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. 14He will bring glory to me by taking from what is mine and making it known to you. 15All that belongs to the Father is mine. That is why I said the Spirit will take from what is mine and make it known to you. 16"In a little while you will see me no more, and then after a little while you will see me." We see there, that the Holy Spirit, being the Testifier, also will "convict the world of guilt in regard to sin and righteousness and judgment". So it is the Spirit's role to Testify and also concince the world of who Jesus is (convict here being like "a conviction of faith or non faith). Jesus says that He is the one who guides people into truth, and who will prepare the disciples for what is to happen to them (strengthen them in the upcoming persecutions and in the work they have to do all over the world) ============== We see the holy Spirit come in power at Pentecost (Acts 2) beginning the work Jesus promised. The disciples, huddled and fearful in the upper room, suddenly are without fear. They are filled with the Holy Spirit and ready and able to go out into the world to preach/testify/witness to what they have seen. They are prepared for opposition (which comes swiftly) and to go to the uttermost ends of the earth, even if it means dying, because they know the truth. The Holy spirit has convicted them of it. Hope that helps.

I am not a firm believer in all the holy trinity thing as it was taught by the church driven intomy head over and over. I have come into knowledge that i was protected from by the church as a child. as i become more aware, things have become clear. the holy trinity is really the father god, the mother god and the son of god. the holy spirit is what we as the childen of god, have with in us, it lives and it grows inside of every human being as we learn our lessons of life. The holy spirit doesnt come down up on us. it is there at our conception and guides us from with in, the little guy on our shoulder, yes thats the holy spirit. it is of god, from god of which we are all part. " know thy self and thou shall know god" through out the bible as i learned i saw many times this reference our self and god being one. That warm feeling that comes over us yes the holy spirit, coming from with in us. I hope this doesnt cause to much confusion. but the awareness i have come to know has given me many enlightened answers to same the questions i asked as a child and got that familiar state/church male dominated answers to.