What is a noun clause and how is it used as a phrase?

What is a noun clause and how is it used as a phrase?

A noun clause is a type of dependent clause that functions as a noun in a sentence. It can be used as a phrase by acting as the subject, object, or complement in a sentence. For example, in the sentence "I know what you did," the noun clause "what you did" acts as the direct object of the verb "know."