Da`wah

Da’wah is an Arabic word which has the literal meaning of “issuing a summons,” or “making an invitation.”  This term is often used to describe how Muslims teach others about the beliefs and practices of their Islamic faith.

“And verily, this (i.e. Allaah’s Commandments mentioned in the above two Verses 151 and 152) is My straight path, so follow it, and follow not (other) paths, for they will separate you away from His path. This He has ordained for you that you may become Al-Muttaqoon (the pious)”[al-An’aam 6:153 – interpretation of the meaning] 
Islam is the last of the heavenly religions and the Qur’aan is the last of the heavenly Books. Muhammad (peace and blessings of Allaah be upon him) is the last of the Prophets and Messengers. Allaah commanded him to convey this religion to all of mankind: 
“this Qur’aan has been revealed to me that I may therewith warn you and whomsoever it may reach”[al-An’aam 6:18]