An adjective alters, modifies or changes a noun or a pronoun to make it more precise and detailed: a "rotten" apple, a "lovely" lady, a "cloudy" day or a "tall," "cool" glass of water.
Adjectives describe or modify words, making writing and speaking much more definite and motivating. Words like big, small, red, blue, soft and sharp are descriptive, making it examples of adjectives.
Adjectives are generally positioned before the noun or pronoun they modify, since adjectives are used to identify, classify or measure individual people and distinctive things. Some sentences may contain multiple adjectives.