Cd Player Car Adapter Is There Such A Thing As A Cd Player Adapter That You Can Play Through A Radio Station In Your Car?

Is there such a thing as a cd player adapter that you can play through a radio station in your car? - cd player car adapter

I have a tape recorder in the car and I listen to CDs with my portable CD player and I am one of those cassette adapter to listen in my car. However, I heard that they send a signal to a radio station if you're a radio with cassette player does not have, you can always have a portable CD player through the radio. Is this true and if so, where can I find one?