Singular means one. A singular noun refers to only one person, place, or thing.
Look at the picture above. There is one parrot in the room, and there is one girl, and one chair. In these examples the nouns parrot, girl, and chair are all singular because they indicate only one.
Plural means two or more than two. A plural noun refers to more than one person, place, or thing.
Look at the picture above to see examples of plural nouns. Most plural nouns in English are regular. That means you can simply add -s or -es to make them plural. But some plural nouns are irregular.