something that you have begun to understand when you were about 4-5 years old
it's stored on your computer but you can easily reproduce it with no tech stuff at all
all you need is just a pen. and a piece of paper
something that's everywhere
and Napster made it easier
something that does require an OS behind it
and an application
.. to be displayed, used, or whatever.
something that some years ago was the distinguish mark of Japanese people on holiday :)
now there's no need of expensive technology, everyone's just mad about it.