Usually people use the word ‘Da’wah’ for the act of conveying the message of Islam, without differentiating whether the person being addressed is a Muslim or a non-Muslim. Many consider ‘Da’wah’ and ‘Islaah’ to be one and the same activity. The appropriate word used for inviting a non-Muslim to Islam is ‘Da’wah’ and for providing correct and additional knowledge of Islam to a Muslim is ‘Islaah’.
Definition of ‘Da’wah’:
‘Da’wah’ means an invitation. In the Islamic context it means an invitation to Islam. Thus Da’wah means conveying the message of Islam to non-Muslims and inviting them to Islam.
Definition of ‘Islaah’:
‘Islaah’ means to improve, correct, rectify or repair. In Islamic terminology, ‘Islaah’ means correcting a Muslim or providing more knowledge of Islam to a Muslim.
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Jazak Allah khayr for that clarification brother Anver. This is a very common misconception amongst the muslims