Final answer:
The subject is the grammatical term that refers to the person or thing performing the action or being described in a sentence.
Step-by-step explanation:
The subject of the question you asked is "What is the subject?"
The subject is a grammatical term that refers to the person or thing that performs the action or is being described in a sentence. It is typically a noun or a pronoun. In the example question, the subject is "the subject."
In this context, the question is asking for the definition of the subject itself, not a specific subject in a sentence.