prose , which means it doesn't have to rhyme but all his works are written in an iambic pentametre
Most likely, the epic play of Romeo and Juliet. Most people know about that play, and have had to, or will eventually, read it in school. Some other well known plays are Macbeth and Hamlet. He wrote...
"Shall I compare thee to a summer's day?" is probably most recognised a being his.
It is Romeo and Juliet, I think.
Romeo and Juliet
Sonnet