Wahy refers to Revelation which consists of communicating God's Messages to a Prophet or Messenger of God. The highest form of revelation is the Qur'an of which even the words are from God.
Wahy is the Arabic word for revelation. In Islamic context, it refers to the revelations and inspirations of God (Arabic: Allah) to his prophets, for all humankind. In Islam, the Qur'an is considered a Wahy given to Muhammad.