What happened to Latin, the origin of romance languages?

According to LatinLanguages, Latin or Latium was the language originally spoken in Rome. Partially through French, about 80% of the English vocabulary is derived from Latin. Although it's not known for sure how Latin disappeared, after the fall of the Roman empire, the romance languages came into existence. If you're interested in linguistics or the origin of English words, then it would be worth researching these other languages and how they evolved from Latin.