How to use the word "Você" ( You ) :

In English we adress someone as "you" both in formal and informal situations. In Brazilian Portuguese the form of address may vary depending on the degree of formality. You will address someone as VOCÊ (plural : VOCÊS ) in informal situations; 
in formal situations you may use the form O SENHOR ( for a man; plural: OS SENHORES ) and A SENHORA ( for a woman; plural : AS SENHORAS ).