Which advertising channel is considered an offline(traditional)channel?

The selected answer,Radio,is considered an offline(traditional)advertising channel because it primarily involves broadcasting audio content to audiences via radio waves,reaching listeners without the need for internet connectivity.Unlike digital channels such as Email,Display Re marketing,and Social Media,which rely on online platforms and technology,radio advertising is rooted in traditional media methods that have been used for decades to disseminate information and advertisements to abroad audience.