countable nouns are viewed as separate objects ex: pens, dogs, ideas while uncountable nouns are viewed as one whole substance ex: ink, gold, oil, air, kindness

countable nouns can be counted one by one, and have single and plural forms: I have 1 pen, 2 pens, many pens, few pens uncountable are not counted separately: I have money, a lot of money, a little money