You mean you've never used it before?? Wow. I first learnt to program it when I was about 8; learnt it by looking at other stacks' scripts. Released a whole swag of freeware programs I wrote in it. Many happy memories. 
The great thing about it is its versatility - if ever I needed a program that could do something specific, but the program didn't exist, there was a good chance I'd be able to knock something up in HyperCard to do the job. Apple are crazy to have discontinued it. I guess though it's more suited to performing elementary computer functions rather than the high end stuff most people use computers for these days. Wouldn't really be much of a drawcard next to iMovie and the like.
As for what you could use it for - lots of stuff! Games (if you could be bothered writing them), basic utilities, endlessly customisable databases, productivity programmes. The best thing I wrote in it was an artificial intelligence program that you could have a conversation with. Pointless but fun. It was an amazing program for its day and if they gave it an overhaul it would still be extremely useful. I guess the closest thing these days is RealBasic, but that's ridiculously hard to use in comparison.
The great thing about it is its versatility - if ever I needed a program that could do something specific, but the program didn't exist, there was a good chance I'd be able to knock something up in HyperCard to do the job. Apple are crazy to have discontinued it. I guess though it's more suited to performing elementary computer functions rather than the high end stuff most people use computers for these days. Wouldn't really be much of a drawcard next to iMovie and the like.
As for what you could use it for - lots of stuff! Games (if you could be bothered writing them), basic utilities, endlessly customisable databases, productivity programmes. The best thing I wrote in it was an artificial intelligence program that you could have a conversation with. Pointless but fun. It was an amazing program for its day and if they gave it an overhaul it would still be extremely useful. I guess the closest thing these days is RealBasic, but that's ridiculously hard to use in comparison.