Adjectives modify or affect the meaning of nouns and pronouns and tell us which, whose, what kind, and how many about the nouns or pronouns they modify. The adjectives come before the noun or the pronoun they modify.
They add basically a quality to the noun or the pronoun which describe what kind of noun it was. For example if the particular sentence talks about a girl, the adjective will say that whether the girl was tall or pretty or short or any other quality about the girl.
