Audio on demand (AOD) refers to a service that allows users to access and listen to audio content, such as music or podcasts, whenever they want, rather than having to listen to it at a specific time or on a specific schedule. AOD services are often provided by streaming platforms, which allow users to listen to content over the internet, or by on-demand audio platforms, which allow users to download audio files and listen to them offline. AOD services can offer a wide range of content, from popular music and radio shows to niche podcasts and audio books.