Obrigado / Obrigada

The words obrigado (male) and obrigada (female) mean thank you in portuguese languange.

It also means obliged.

The thanking expression comes from the sentence <<I feel obliged to thank you. >>

That is why men shall say obrigado and women shall say obrigada.

You can also say muito obrigado or muito obrigada, it means thank you very much.