Just to add to Rodman's and Elizabeth's responses, yes most computer audio cards have a line input jack (usually color-coded blue). You'll need the cable that Rodman mentions and some software to receive and store the signal. Rodman mentions Mixcraft which will work fine but only for 14 days - then you have to buy it. Another option is Audacity which is free. Just set either to take their recording input from the Line In jack, start the recording function, start the tape playing and you're off. You can then use the software to edit out any "clunks" you get from starting and stopping the tape, chop it into tracks, etc. I believe there are even functions to minimize tape hiss unless you're trying to be a purist.
How does one copy cassette tapes to computer?
I have a friend who wants to save his recordings he has on cassette to his computer. Are there any products out there that could do this, and how would one go about it? I would be interested in knowing the answer to this myself. I know there are products out there for transferring vinyl to the computer, but what about cassettes?