What is a difference between a claus and a phrase

A clause is a group of words that contains a subject and a predicate and can function as a sentence or as a part of a sentence. A phrase, on the other hand, is a group of words that does not contain a subject and a predicate and cannot function as a sentence on its own.

In simpler terms, a clause is a complete thought that can stand alone as a sentence, while a phrase is a group of words that adds meaning to a sentence but cannot stand alone as a sentence.