Fard (obligation) is divided into two in terms of a person who is a Muslim

Fard (obligation) is divided into two in terms of a person who is a Muslim.

1) Fard al-Ayn: It’s the fard that is the duty of every Muslim.

2) Fard al-Kifayah: When some Muslims fulfill the duty, others are not held responsible for it. (Ömer Nasuhi, Istılahatı Fıkhıyye Kâmusu, 1, 33)

Fard al-Ayn precedes Fard al-Kifayahin terms of virtue and good deeds. For, if something is general its hardship decreases. When it becomes specific, it will be harder. When Fard al-Kifayah is abandoned, all people are held responsible for it. (Ibn Abidin, Raddu`l-Mukhtar, I, 42)