Romeo and Juliet is constantly being adapted and remade.  Here are a few trailers (and a music video) that should give you an idea of what the play is about.

Zeffirelli's 1968 Romeo and Juliet is generally considered one of the best Shakespeare movies of all time! It's setting is true to the time period that Shakespeare placed the play.

This is a trailer for a movie called West Side Story.  It's an updated version of Romeo and Juliet.  It is set in the 1950s in New York City and instead of warring families, there are rival gangs.  You may have heard of the Sharks and the Jets.