Radio advertising is any advertising effort featured via AM, FM, satellite, or online radio.

Radio advertising typically takes the form of commercials between segments or sponsored, featured daily or weekly segments. Radio ads also require frequency, as typically a company will run at least 24 ads in a given radio-based campaign.

Radio advertising remains a cost-effective solution for reaching large audiences, exposing them to your brand and your products, services, or offers. Typically, radio stations are keenly aware of their listener demographics, giving you options to reach targeted, specific ages/genders with your advertising efforts.

References

https://en.wikipedia.org/wiki/Radio_advertisement

https://study.com/academy/lesson/what-is-radio-advertising-definition-types-examples.html

https://www.entrepreneur.com/encyclopedia/radio-advertising