Times have changed. The age of analogue data is behind us, for digital data, our savior, are come.
Digital data are not infinitely divisible like analogue data are. They are discrete data. Discrete data They are represented by a (finite) string of digits, which are either 0 or 1. Every datum on a computer system is represented by 0s and 1s. Here's what one might look like:
10101010110110101111011011111100001010110001100101010101010110110111010101 10100100100100010100011010101110010101010101010110101010101101011010101101 00010010101010010101010101011010101010110101101010100111010101001001110101
Digital data can be easily stored, duplicated, transferred, edited, processed, accessed and converted into analogue. They also last longer. Twenty years ago, your favourite Charles Dickens book would yellow with age, was difficult to copy, hard to send overseas, and so on. With digitalisation by Project Gutenberg, you can now copy it with one click, transfer it to your overseas friends instantly, painlessly make changes to it. You can even print out high-quality copies (convert to analogue) and sell it to people gullible enough to buy it.
This online course is devoted to these little bits of data. (Pun intended...)