A noun is a person, place, thing or idea. It is a part of speech in the English language. However, there are different types of nouns. One is singular and another is plural. Singular nouns means that there is only one noun. Plural nouns means that the noun is more than one. There is also a noun that refers to a group of things. This is called a collective noun.
The collective nouns are treated as a singular noun even though they include a group of things. One example of this would be a jury. A jury is a group of people who make a decision about a court case. These people on the jury must meet together to come up with a verdict. They act as one group of people.