This is the 1011th most frequent Polish word.
będą
"Will be."
The word 'będą' here is used as an auxiliary verb indicating future tense for the third person plural.
Oni będą gotowi na czas.
They will be ready on time.
'Będą' is used in the conditional clause to describe a future condition for third person plural.
Życie tych ludzi będzie pełne przygód, jeśli będą odważni.
The lives of these people will be full of adventures if they are brave.
Here, 'będą' works with an infinitive verb to denote the future tense for third person plural.