Everybody in the world that browses the Web expects the browser to show Web pages in their own language. This is a very natural expectation and we take this for granted.
The UTF character set contains letters for most of the world's languages. UTF is getting very common in the past few years and will probably be the default character set in the coming years. Java was among the first programming languages that supported UTF, but other programming languages have been following their footsteps lately.
Out of curiosity, we crunched some Web site data and of the Web sites, we studied, 20.07% use "windows-1252" encoding, 41.53% use "utf-8", 36.57% use "iso-8859-1" and other encoding types are insignificant.
Further information on encoding and making your Web site International: