The Qur'an is the word of Allah, the Almighty. Sunnah is the action & words (sayings, also called Hadith or hadees) of Prophet Mohammad (peace be upon him).
The collection of the Hadith is done by religious men like Bukhari, Abu Dawood.....
While there is only ONE version of the Qur'an--unchanged, unaltered since the time it was revealed to the Prophet Mohammad (peace be upon him), the hadith may need to be checked for authenticity, as they were collected by humans.
The Quran and Sunnah together form the basis of Shariah or Islamic law.
the Quran is the Muslim's holy book that reflects real God words of God as revealed to prophet Muhammad (PBUH), and
the Sunnah is the prophet Muhammad's (PBUH) sayings and practices
It is an Islamic requirement to follow both Quran and Sunnah
