A phrase is a group of words that work together to convey a specific meaning but does not form a complete sentence. Phrases can serve various functions in language, such as acting as nouns, verbs, or adjectives. For example, the phrase in the park describes a location but does not express a complete thought on its own. There are different types of phrases, including noun phrases, verb phrases, and prepositional phrases. Each type has its own structure and purpose. For instance, a verb phrase might include a main verb and its auxiliaries, like in the phrase is running, which indicates an action but still requires additional context to form a complete sentence.