This is the 105th most frequent Catalan word.
cal
"Cal" means "it is necessary" or "one must" in English.
In this sentence, 'cal' is used impersonally to express necessity or obligation.
Cal estudiar molt per superar aquest examen.
It is necessary to study a lot to pass this exam.
Here, 'caldrà' (future tense) communicates a future necessity.
Caldrà parlar amb el director per resoldre el problema.
It will be necessary to speak with the director to solve the problem.
In this example, 'cal' in its negative form 'no cal' indicates the lack of necessity.