Special revelation is a theological term which refers to the knowledge of God and spiritual matters which can be discovered through supernatural means, such as scripture, miracles, or incarnation. Theologians use this term to describe knowledge of God or spiritual matters that would not be available to mankind without God's intervention to make that knowledge available.
Special revelation is contrasted with general revelation, which refers to the knowledge of God and spiritual matters which can be discovered through natural means, such as observation of nature, philosophy and reasoning, or conscience.
Taken together, general revelation and special revelation form the complete body of knowledge that is available to mankind about God and spritual matters.