Sunnah (Arabic Sunnah) is the word, action and decision of the Prophet (peace and blessings of Allaah be upon him). The Qur'an commands obedience to the Prophet (peace and blessings of Allaah be upon him). The Sunnah is an act that the Prophet (peace and blessings of Allaah be upon him) did and encouraged to do, in addition to the obligatory and the obligatory.

Circumcision is divided into three:

I. Muakkad Sunnah (approved Sunnah). The Sunnahs of the Prophet (peace and blessings of Allaah be upon him) that he performed regularly and sometimes did not. For example, the Sunnah of the morning, afternoon and evening prayers. He will be rewarded for following these Sunnahs. A person who fails to do so will be charged, even if he is not punished.
2. Non-mu'akkad Sunnah (unconfirmed Sunnah). The Sunnahs of the Prophet (peace and blessings of Allaah be upon him) sometimes performed and sometimes not performed. I am a worshiper
This is the first Sunnah of the evening prayer. It is good to follow these Sunnahs, and there is no sin if they are not done.
3. Zawaid Sunnah (excess Sunnah). If these Sunnahs are performed out of love for the Prophet, there are many rewards, if not fulfilled
no sin. The faqihs explained from these commands the need to obey the Sunnah of the Prophet (peace and blessings of Allaah be upon him), thus forming the second source after the Qur'aan.