Prophet Muhammad (peace be upon him) is the last and final Prophet sent by Allah. He came after all the other Prophets like Prophet Musa (AS) and Prophet Isa (AS). Allah sent him to teach people the right path, and the Quran was revealed to him. After him, there will be no new prophet, and that's why we call him "Khatam-un-Nabiyyin", which means "Seal of the Prophets.