My father was a Baptist preacher!  Are you religious?
A preacher is someone who delivers sermons or homilies on religious topics. I am atheist myself.
Oh, to each their own.  When did preachers become a mainstay?
The sermon has been an important part of Christianity since the first century CE.
I guess that makes sense.  Does every religion have preachers?
No, many faith traditions encourage self-reflection and meditation.
Interesting.  How does one become a preacher?  Preacher school!?!
There are lay preachers who are self-taught. The more formal preachers usually attend a seminary for training.