The Holy Spirit is God’s power. God used it to create the world and all life upon it. It was also used to cause the Bible to be written, a process known as “inspiration”. The Bible describes how God granted some of his followers use of the Holy Spirit to perform miracles, but these gifts aren’t available today.
“So shall My word be that goes forth from My mouth; It shall not return to Me void, But it shall accomplish what I please, And it shall prosper in the thing for which I sent it.” -Isaiah 55:11