What describes who or what a sentence is about?

The part of a sentence that describes who or what the sentence is about is called the subject.

Here's a breakdown:

* Subject: The noun or pronoun that performs the action of the verb or is described by the verb. It's the "who" or "what" of the sentence.

* Verb: The action word that tells what the subject is doing or being.

Examples:

* The dog barked loudly. (The subject is "the dog," and the verb is "barked")

* She is a talented artist. (The subject is "she," and the verb is "is")

* The car needs a wash. (The subject is "the car," and the verb is "needs")

Let me know if you'd like more examples!