Romance languages are a group of languages that evolved from Vulgar Latin, the colloquial form of Latin spoken by the common people of the Roman Empire. They include widely spoken languages such as Spanish, French, Italian, Portuguese, and Romanian. These languages share a significant amount of vocabulary and grammatical structures due to their common origin. The spread of Romance languages can be attributed to the expansion of the Roman Empire and later cultural influences. Today, they are spoken by millions of people around the world, making them an important part of global linguistic diversity.