The document discusses the Arabic influence on the Spanish language. It notes that Arabic is the second largest influence on Spanish after Latin, with over 4,000 Arabic loanwords in Spanish making up around 8% of the vocabulary. This is due to the Islamic rule in Spain between 711-1492 AD. Many common Spanish words like almohada (pillow), azúcar (sugar), and alcachofa (artichoke) originate from Arabic. The absorption of Arabic words increased the expansion of the Kingdom of Castile into Muslim lands.