It's the Italian female equivalent of the male adjective "Bravo".
it is then referred to a woman to compliment and approve her action.
At the theater you should yell "BRAVA!" to congratulate a Soprano or other woman singer, not bravo (that's for a man)!
Bravissima is the superlative for a woman, so you can yell that to. (Bravissimo for a man)
e.g. Brava! Ottimo lavoro!
(Brava! excellent job!)
e.g. Ms. Maria Callas was such an excellent soprano that people acclaimed yelling her, "Bravissima!"
It's the Italian plural for the male adjective "Bravo".
it is then referred to men or to people in general (of different sexes).
e.g. Bravi! Ottimo lavoro!
(Bravi! excellent job!)