Episodic: The programming is just about anything, in many languages, from many countries (including the USA). There are designated bands for "WorldBand" programming; between those bands are other bands used for utility purposes (Coast Guard, Aviation, Amateur Radio, etc).
The same station (like the BBC, for example) in will usually have time slots across the bands where in the first slot they do English language, the next slot french, then slavic, arabic ... etc . Sometimes they have multiple concurrent slots on different bands, each band in a different language.
Radio China has "Learn Chinese" lessons, most stations offer a variety of music, some talk (ala NPR) ... there's AFRTS (A-FARTS - the US military entertainment network), some stations are primarily religious programming .... there's a pretty broad spectrum of content.
In addition, you can listen in on Coast Guard activity, possibly some international flights (at the least, the international airport weather reports), Ham radio conversations., WWV (standard time setting) ... and just about anything else you can think of.
It's interesting to hear the world news presented from other country's perspective ... taken with a grain of salt ... there's some pretty hard-core propaganda ... depending on who you are listening to (including the USA).
Worldband is good for language students to give them some real exposure to the language they are learning ... local accents & such.
The drawback is that it's all AM or SSB, so the tonal quality is less-than-stellar much of the time - hence, it's important to get a radio with decent specs to make it a little more "listenable."
If you travel internationally, it's a good way to keep in touch with the events "back home."
There's even some "Number Stations:" every now & then you come across a station that is speaking number groups. It's alledged that these are countries putting out code to their field agants ... I've never seen any real explanation ...
It can be interesting. Next time you're in the book store, look for a book called "Passport to Worldband Radio" and give it a look. It has all the schedules for the year, some radio recommendations / Buying Guides, antennas & other related information.
FWIW
Scott