"Le" is a definite article in the French language, used to indicate a specific masculine noun. It is equivalent to "the" in English and is essential for proper grammar in French sentences. For example, in the phrase "le chat" (the cat), "le" specifies which cat is being referred to. In French, articles like "le" help convey gender and number. While "le" is used for singular masculine nouns, the feminine counterpart is "la," and the plural form for both genders is "les." Understanding these articles is crucial for mastering basic French grammar and communication.