Dawah means inviting people to God and Truth. As the Prophet of Islam was the last prophet, the responsibility of dawah is now the duty of the Muslim Ummah. Every Muslim is charged with this mission, as God says in the Quran: “Let there be a group among you who call others to good, and enjoin what is right (marouf), and forbid what is wrong (munkar): those who do this shall be successful.” (3:104)

The fulfillment of this mission, on the individual level, however, varies with the capacity of the Muslim, including their linguistic abilities, confidence, and knowledge.

A dayee (addressor) is an individual who invites others to God and the Truth. A madu (addressee) is the one called to God and the Truth. The successful dayee introduces man to God and His Creation Plan with all sincerity and well-wishing. A dayee is an individual who invites people to God and the truth and makes them aware that they have to bring about an intellectual awakening in themselves so that they may, in recognizing these two demands, control their ego and strengthen the subtle voice of their conscience. Avoiding Satan’s temptations, they may become travelers on God’s path, which will take them to Paradise. This was the mission of the prophets. A dayee takes up this mission in the hope of being given a very special reward in the form of eternal Paradise.

Source: Calling People to God