What is the difference between a clause and a phrase?

What is the difference between a clause and a phrase?

A clause is a group of words that contains a subject and a predicate and can function as a complete sentence or as part of a sentence. It expresses a complete thought. On the other hand, a phrase is a group of words that does not contain a subject and a predicate and does not express a complete thought. It functions as a single part of speech within a sentence.