How many times you have seen some strange characters in an email or on any web site. How many times, as a developer you have seen that your code/content is getting converted to ‘?’ and users complained.
Previously, internet was limited to english (ASCII) but as soon as it started getting used globally, ASCII was not enough to help…..
If you want to read ABC of multibyte characters, ABC of character sets…. read this article written by Joel, one of my favorite writer…http://www.joelonsoftware.com/articles/Unicode.html
Pankaj Upadhyay 
hello,good one