The Hadiths are traditions of Muhammad, giving us important information about his life. They are usually narrations about a certain incident in which he said or did something. This is how Muslims determine the Sunnah (Muhammad's way of life.) It is key to Islam since Muslims are commanded to obey Muhammad and emulate him. In fact, four out of five of Islam’s Pillars would not exist without the Hadith, therefore making Islam impossible to practice.