- Used when talking about things that are uncountable or have no plural
- Is compatible with collective nouns, non-countable nouns and volumes
There is less light in the bedroom than in the living room.
We must try to spend less money this year.
Many women earn less than men in this country.
- Used when talking about things or people in the plural
- Compatible only with countable nouns and individual items
She needs fewer clothes now that she has moved to a warmer country.
There seem to be fewer people in the room now.
I have bought fewer apples than you.