The need to send Prophets to this world was because God wanted to send guidance to humanity towards understanding the purpose of creation and the principles of righteous living. As such, Prophets are sent by God to inform mankind of realities which, for ordinary people, lie beyond the realm of human vision. They are sent as messengers, communicating divine revelations to their communities to help individuals discern right from wrong and navigate their lives in accordance with God's will. Throughout history, God sent the same religion of submission to God—Islam—through the prophets. As there was no way to record and preserve the guidance sent through the prophet before the advent of the Prophet of Islam, when the previous teachings became distorted, God sent another Prophet to revive the true spirit of religion. In essence, the Prophets fulfilled the crucial role of conveying God's guidance, ensuring that humanity has access to the divine principles necessary for a meaningful and ethical existence.
Source: The Spirit of Islam Magazine