XeTeX

Xetex is a computer program which allows people to type in different languages and create documents. It lets you write in languages like Arabic and Devanagari, which are languages that use different characters than the ones used in English. It also has tools which make it easier to add formatting like bold and italic to text, and fonts which look nice when printed out. Basically, Xetex helps people type in different languages, and do it in a way that looks neat on paper.