What is hadith?

What is hadith? Hadith is a collection of the narrations of the Prophet (pbuh) in which his commands, his actions and his approvals are compiled. Prophet Mohammed (pbuh) happens to be the only person in the history of mankind whose actions, commands, approvals.. entire lifestyle is preserved in the books. How he walked and how he talked and how broad his lips went when he laughed , all is preserved. Preservation of Hadith is a preservation of the  Implementation of Qur’anic injunctions.