This is because they evolved from Vulgar Latin, the language spoken by the common people of the Roman Empire, as opposed to the Classical Latin used in literature and official documents.
Here are some examples of Romance languages:
* Italian
* Spanish
* French
* Portuguese
* Romanian
* Catalan
* Galician
* Sardinian
While these languages share a common ancestor, they have evolved significantly over time, developing unique features and distinct dialects.