God knew that we would need help after Jesus left. That’s why He sent the Holy Spirit.
The Holy Spirit is a part of the Trinity that is wrapped in mystery. It is the silent partner, as it were.
Not much is known about the Holy Spirit as far as the part it plays in God’s universe. However, much can be known about its role with humanity.
Just before Christ left this world, he promised to send a comforter, someone who would strengthen us in our most desperate times of need.
This video goes deeper into our understanding of the Holy Spirit.