Question

What do you mean by prefix

Answer 1

A prefix is an affix which is placed before the stem of a word. Adding it to the beginning of one word changes it into another word. For example, when the prefix un- is added to the word happy, it creates the word unhappy.

Answer 2

prefix r da words which cones at da beginning n make a new word.
for ex - dis (prefix) + interest (main word)
=
disinterest