The Holy Spirit is truly God and equal with the Father and the Son, adored with the Father and the Son. He is a Person, not just a general "force" or "movement".
One of the key differences between the Catholic Church and the Orthodox Churches is that we rightly believe in the doctrine of the Filioque - which states that the Holy Spirit proceeds not from the Father only, but from the Father "and the Son". This must be held, since the Person of the Son is defined as the one who proceeds from the Father alone -- thus, if the Spirit did not proceed from both the Father and the Son, he would not be distinguishable from the Son.
With further reflection, we see that the Holy Spirit, as proceeding from both the Father and the Son, is the procession of Love. If we desire to grow in Divine Love, we must grow in our devotion to the Holy Spirit.
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