Radio advertising can certainly be called 'word-of-mouth' advertising. In this type of promotion, a company spends money purchasing commercials to advertise the services and products. An advertiser (company or business) pays a commercial radio channel for airtime in the radio commercials. And, then the radio station broadcasts the advertisement to its listening audience in return. Visit our official website to learn more!
https://www.excellentpublicity.....com/services/radio-

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