This is the 417th most frequent Russian word.
прав
Correct; right.
Прав is used here to express agreement with someone's correctness or truth.
Ты совершенно прав.
You are absolutely right.
Прав is used here as a predicate adjective to express correctness in a belief or statement.
Она считает, что прав её брат.
She believes that her brother is correct.
Прав is used to refer to someone being correct in a past context, denoting truth or correctness.