God conveyed His message to man through Mohammad (saw). This took two forms
Quran and Sunnah.
The Sunnah (Tradition) of the Prophet which is an unerring guide to man in respect to all that is permissible and all that is prohibited in the eyes of God. Without this belief in the Prophet, belief in God would become a mere theoretical proposition.
The Sunnah, is the example of practical leadership and the ideological guidance provided by the Prophet, which transforms belief in God into a culture and a civilization, and enables man to evolve a way of life. We get through the Prophet not only rules of guidance, but a complete scheme of values and a practical code of conduct. No one can be a practicing Muslim unless he believes in the prophethood of the Messenger and follows his life example as he believes in God.
Sunnah of prophet Mohammad in what he ordered, forbade, did or acknowledged in his capacity as prophet. The Sunna sometimes explains the Quran, illustrates it, details some generalities and complements it in some areas.
Allah created man for a noble purpose: to worship Him and lead a virtuous life based on His teachings and guidance. How would man know his role and purpose of his existence unless he received clear and practical instructions of what Allah wants him to do? Here comes the need for prophethood. Thus Allah had chosen from every nation a prophet or more to covey His Message to people.
Prophethood In Islam it's status and significance.
Meaning communication or narrative, it is the record of an individual saying or action or approvals of Muhammad (s.a.w.) taken as a model of behavior by Muslims.
The sayings and the traditions of Prophet Muhammad (s.a.w.) are called Hadith. These are the real explanation, interpretation, and the living example of the Prophet (s.a.w.) for teachings of the Qur'an. His sayings are found in books called the Hadith books.
Some famous collectors of Hadith are Imam Al-Bukhari, Imam Muslim, Imam An-Nasa'i, Imam Abu Dawood, Imam At-Tirmizi, and Imam Majah.