It used to be that when something was broadcast like a tv or radio show, you watched or listened when it was broadcast.
When I was a boy, we lined up our chairs in front of the radio to listen to “Yours Truly, Johnny Dollar”, “The Long Ranger”, “The Shadow” and others. You had to listen when they were broadcast.
Now with TiVo, On Demand, Recordings, and the Internet, we can listen to most broadcast shows at any time. This is called time shifting. Time shifting typically refers to TV shows, but it also refers to Internet audio like podcasting.
We can now schedule our listening and viewing in the same way we schedule our reading – at our convenience.
On the other hand, with things being time shifted, most every show is available at all times, giving us even more listening and viewing choices.