IPA: /ˈpɒpjʊləraɪzə/
KK: /ˈpɑp.jə.ləˌraɪ.zər/
A person who makes something well-known or widely accepted by many people.
The popularizer of the new technology helped it gain acceptance in the market.
Popularizer → It is formed from "popular" (from Latin *popularis*, meaning of the people) and "-izer" (a suffix used to indicate a person or thing that performs a specified action). The word "popularizer" refers to a person who makes something well-known or accessible to the general public.
Think of someone who makes ideas or things more 'of the people' ('popular') — the '-izer' means they are the one doing that action.