Also sometimes called Castilian, Spanish originated in Castile region of Spain. The Romance language is spoken as a first language by over 406 million people around the world; only Mandarin has more native speakers worldwide. It's one of the United Nations' six official languages. Spanish is part of the Ibero-romance group of languages and evolved from multiple dialects of vulgar Latin following the collapse of the Western Roman Empire around 500. However Spanish was not documented until almost four centuries later.

It's been heavily influenced by the Basque language, spoken in the North, and by Arabic thanks to the heavy Muslim presence in the southern parts of Spain. Modern Spanish further incorporates wors from other Romance languages, especially French and Italian.