A phrase is a group of related words (within a sentence) without both subject and verb. For example, He is laughing at the joker.
A phrase functions as a noun, verb, adverb, adjective or preposition in a sentence. The function of a phrase depends on its construction (words it contains). On the basis of their functions and constructions, phrases are divided into various types i.e. noun phrase, verb phrase, adverb phrase, adjective phrase, appositive phrase, infinite phrase, participle phrase and gerund phrase.