A "word" is a basic unit of language that carries meaning. It can be spoken, written, or signed, and is made up of one or more sounds or letters. Words are used to form sentences, allowing people to communicate ideas, emotions, and information. Words can be categorized into different types, such as nouns, verbs, adjectives, and adverbs. Each type serves a specific function in a sentence. For example, a noun represents a person, place, or thing, while a verb indicates an action or state of being. Understanding words is essential for effective communication.