How to use the VOSOTROS form of the subject pronoun

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What it the vosotros verb form in Spanish?

A grammatical explanation
Vosotros, in grammatical terms, is second person plural familiar form of the verb. It occupies the fifth position on our verb paradigms (see the paradigm and examples at the end of this article).

But when do you use it?
If you already know something about the difference between 'tú' and 'usted', you can make the same comparison between 'vosotros' and 'ustedes'. In very broad terms, 'tú' is used for people you are friends with or on a first-name basis with, and 'usted' is for someone you might call 'Mr.' or 'Mrs.' in English. This is frequently called 'informal you' (tú) and formal you' (usted). Vosotros and ustedes are exactly the same thing, but in the plural form - that is, vosotros is 'informal you plural' and ustedes is 'formal you plural'.

Geographic usage
The vosotros form is used on a daily basis in Spain and rarely even heard in the rest of Spanish speaking world outside of church and in books and films that come from Spain, although people in other Spanish-speaking countries do understand it. Spanish speakers outside of Spain only use the 'ustedes' form for both formal and informal you plural.