Character (computing)
ASCII is still widely used, especially in the English-speaking areas.  The Internet was started in English, and until 2010 URL addresses could only contain certain ASCII characters. Some ASCII characters that are not supported are replaced by a '%' and a number for its location in the ASCII table.  The space character, for instance is changed to "%20" when it shows up in a URL.  In 2010, Unicode was allowed so people who spoke Russian, Greek, Chinese or other languages could see a domain name in their own language.