Assalamu alaykum
Fard is:
An act commanded by Allah in the Holy Qur’an is known as Fard. The following explains a Fard in detail:

a. An act that is obligatory to be executed
b. It has been proven by rigorously authenticated texts
c.  The denial of any Fard renders one to come out of the folds of Islam.
d. If one omits to perform any Fard without any valid shari’i reason, then such a person becomes a fasiq (transgressor) and the person is regarded as a major sinner. [Fatawa Ridawiyyah – Vol. 2, Page 194]
And Allah knows best!