A proper noun describes a person, place, or group; some examples include Paris, Dianna, Michael Jackson and Maryland. Titles, months and days of the week are also proper nouns.
Proper nouns differ from common nouns in that they are more specific and always capitalized. For instance, the sentence, "He is a man," uses a common noun to indicate that the subject is male. However, the sentence, "The man's name is Craig," uses a proper noun to specifically state the man's name. Similarly, the word "company" is a common noun that refers to a business. MacDonald's and Samsung are proper nouns that identify a specific business by name. Other examples of proper nouns include film titles, such as "Jurassic World" and book titles, such as "A Tale of Two Cities."