"L'" is a French contraction that combines the preposition "le" or "la" with a word that begins with a vowel sound. This contraction is used to make speech and writing smoother and more fluid. For example, "l'ami" means "the friend" in English, where "ami" starts with a vowel. In French grammar, using "L'" helps avoid awkward pauses and maintains the rhythm of the language. It is commonly found in everyday conversation and literature, making it an essential part of mastering French pronunciation and grammar.