HyperCard is an application program and a simple programming environment designed by Apple Computer. It was designed by Bill Atkinson and released first in 1987. It uses a "stack" of virtual "cards" as its basic metaphor; cards can be interconnected by hypertext links (thus the name of the program). Text and graphics can be placed on each card. It can be used as a simple database. The programming language HyperTalk comes with the product and can be used to make the stacks do useful and interesting things.
HyperCard is one of the first products that made use of and popularized the hypertext concept to a large popular base of users. After some years of nondevelopment, Apple has in recent years been releasing new versions and upgrades.
We need more about what it can be used to do...