Final answer:
A Set-top box (STB) enables viewing of digital channels and access to pay-per-view and video-on-demand services on a television, by decoding the digital signals from a cable or satellite provider.
Step-by-step explanation:
The device that allows a customer to view digital channels and access pay-per-view (PPV) as well as video-on-demand (VOD) services is a Set-top box (STB). This device can receive and decode digital signals from a cable or satellite provider, enabling the viewer to watch digital content on their television. Users can also navigate and choose PPV events or select movies and shows from a VOD library, which may include current and older content, some of which may contain unskippable advertisements. With advancements in digital technology, services like Netflix have further influenced the viewers' shift towards streaming platforms, providing instant access to a vast library of content.