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Proper adjectives, like all adjectives, modify nouns, but they are different from other adjectives because they are actually formed from proper nouns.
They are often made from the names of cities, countries, or regions to describe where something comes from, but they can also be formed from the names of religions, brands, or even individuals.
An adjective formed from a proper noun.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
an adjective formed from a proper noun, as American from America.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.