IPA: /əˈnaʊnsər/
KK: /əˈnaʊnsər/
A person who speaks to an audience to introduce programs, read announcements, or provide commentary, especially on television or radio.
The announcer introduced the next segment of the show with great enthusiasm.
Announcer → It is formed from "announce" (from Latin "annuntiare", meaning to report or make known) and "-er" (meaning a person who). An announcer is a person who makes information known or reports something.
Think of someone who 'makes known' ('annuntiare') information — that's what an announcer does.