Hypertext is found in many contexts, the most well known of which are nowadays probably the World Wide Web and Windows online help assistants.
But the concept dates from the 1960s, or even earlier, and not all hypertext is electronic.
Many kinds of publication have hypertext properties, though these often remain latent:
All these covert hypertexts (latent hypertexts, implicit hypertexts) share the basic structural properties of hypertexts, and may be converted into overt hypertexts (patent hypertexts, manifest hypertexts, explicit hypertexts).