What is a comparative form?

Answer 1

It is the form of an adjective that is used to compare two things.

Jack is big. -- adjective = big

Jack is bigger than me. -- comparative adjective = bigger, compares Jack to me

Answer 2

A comparative form is used to compare two things, showing the degree of difference between them. It is typically formed by adding -er to the end of an adjective (e.g., "bigger") or by using the words "more" or "less" before the adjective (e.g., "more interesting").