I am babysitting. I am watching tv. I am writing. Articles are little words that point out Nouns. They tell us that there will be a Noun ahead in the sentence.
Nouns are words that name a person, a place, a thing, an idea, a feeling or an action.
Any word we use to name something is a Noun. THE is used to point out a definite noun, the only one of its kind, a special one. I am the teacher. I am the boss. I am the janitor.