This is the 9845th most frequent French word.
falloir
"Falloir" means "to be necessary."
The impersonal verb 'falloir' is used here to indicate a necessity or obligation.
Il faut étudier pour réussir.
It is necessary to study to succeed.
'Falloir' followed by a subjunctive clause indicates personal necessity or responsibility.
Il faut que je parte bientôt.
I need to leave soon.
'Falloir' introduces a general requirement or necessity for a situation.