They allow you to enter an Internet address using characters from languages such as Chinese, Japanese, and Korean.
Acceptable characters are letters, hyphens, and numbers.
However, domain names cannot begin or end with a hyphen. Your domain name will work just like any other domain name. However, the end user's browser must be updated to support the necessary languages. An end user types an Internet Address into their browser using their chosen character set. The domain name then resolves to an IP address and displays the web page in exactly the same way as an English domain name would.