Latin is a language. Latin was spoken and written all the time in Italy 2,000 years ago. Now they just use Italian instead. Many languages have developed from Latin, which proves that these languages were made by humans and not God, like some people would have you believe.
Its a bit pointless because there are no native speakers of Latin anymore, however knowing Latin helps you do well on you SAT's, but studying Latin makes you a bit of a geek (not that that matters, because being a geek is worth doing well on you SAT's!). Most of us don’t need Latin.
Only archaeologists and Histrorians specializing in the Roman period need to know Classical Latin. Up to the 18th Century intellectual books were frequently written in Latin. Therefore Latin is useful for many historians. Mediaeval historians need to know church Latin.