Muslims believe that there are five main pillars or essential duties of Islam. Which of the following is not included in the five pillars

The Five Pillars of Islam are:

1. Shahada (Faith): Declaring the belief in the oneness of God and the prophethood of Muhammad.
2. Salat (Prayer): Performing the five daily prayers.
3. Zakat (Charity): Giving a portion of one's wealth to the poor and needy.
4. Sawm (Fasting): Observing the fast during the month of Ramadan.
5. Hajj (Pilgrimage): Making the pilgrimage to Mecca at least once in a lifetime for those who are able to do so.

The concept of Jihad is an important aspect of Islam, but it is not one of the five pillars. Jihad refers to the internal and external struggle to follow the teachings of Islam and to defend the faith when necessary.