This is the 15082nd most frequent Russian word.
поймут
"Поймут" means "they will understand."
The word 'поймут' is used as a verb in in the future tense, third person plural, meaning 'they will understand'.
Люди поймут, что истина важнее всего.
People will understand that the truth is more important than anything.
Here, 'поймут' is part of a subordinate clause in a conditional sentence, indicating a future event based on the preceding condition.
Если вы им объясните, они поймут, почему это важно.
If you explain it to them, they will understand why it is important.
In this sentence, 'поймут' reflects the students' ability to comprehend the subject matter in a hypothetical future situation.