"De" is a versatile word often used in various languages, most notably in Spanish and French. In Spanish, it means "of" or "from," indicating possession or origin. For example, in the phrase "el libro de Juan," it translates to "the book of Juan," showing that the book belongs to Juan. In French, "de" serves a similar purpose, linking nouns to express relationships. For instance, "le livre de Marie" means "the book of Marie." Additionally, "de" can be used in expressions of quantity, like "un verre de vin," meaning "a glass of wine." Its usage is essential for clear communication in both languages.