-Comparative adjectives compare one person or thing with another and enable us to say whether a person or thing has more or less of a particular quality:
Josh is taller than his sister.
I’m more interested in music than sport.
Big cars that use a lot of petrol are less popular now than twenty years ago.
-Superlative adjectives describe one person or thing as having more of a quality than all other people or things in a group:
The ‘Silver Arrow’ will be the fastest train in the world when it is built.
The most frightening film I’ve ever seen was Alfred Hitchcock’s ‘Psycho’.
What is the least expensive way of travelling in Japan?
