What is difference between radi program promo and radio Station ID?

Answer 1

A "promo" is a "promotional" announcement of some sort, that generally says

something like "You and all your friends should listen to this radio station as

much as you can because it is the greatest." The reason for these announcements

is to build the station's listening audience by convincing you that this station is cool.

A "station ID" or "Identification" is a legal requirement of every licensed radio

station. When I was on the radio, a legal ID consisted of the station's call-

letters and location, and had to be spoken in plain language within 5 minutes

of every hour and haf-hour. I don't know what the legal requirement is now,

as my experience dates from the BMDF&A era (before Marconi, DeForest, and

Armstrong, roughly contemporary with Maxwell and Hertz).