This is the knowledge of information previously unknown and imparted by God supernaturally.
“To one there is given through the Spirit a message of wisdom, to another a message of knowledge by means of the same Spirit, to another faith by the same Spirit, to another gifts of healing by that one Spirit, to another miraculous powers, to another prophecy, to another distinguishing between spirits, to another speaking in different kinds of tongues, and to still another the interpretation of tongues.” 1 Corinthians 12:8-10
Knowledge has to do with the discovery of truth while wisdom has to do with its application in life.
It cannot have any known information beforehand. It is completely shooting in the dark but you’re not because God is revealing the facts, information, details whether in the past or the present and most probably when you are praying with that person.
Holy Spirit I ask that today you will give me messages of knowledge that those people I meet I will see them as divine appointments made by you. Give me the insight I need whether through pictures, words, insights into their lives and then give me the wisdom to lead them into beautiful new chapters of their lives with you . Give me the courage to speak up and say what you show me and above all let Jesus be seen and glorified. Amen.
Missions Paul 