God has told people about himself in the Bible, a specific and detailed revelation of himself, which gives us details regarding his person and what he expects of people. It is not complete revelation, though: natural revelation is complementary and completes his revelation of himself.

God's divine self-revelation evidenced specifically in salvation history and culminating in the incarnation of Jesus Christ (coming to earth as a man)

Special revelation is a theological term that states a belief that knowledge of God and of spiritual matters can be discovered through supernatural means, such as miracles or the scriptures, a disclosure of God's truth through means other than through man's reason.