Regional Interface is nothing but a translated version of the main Search Engine. Many Search Engines have interfaces in different languages such as French, German, Spanish, Japanese etc. However, the only difference between these regional interfaces and the main version of the Search Engine is that the language used on the interface is not English. In other words, if you search using a keyword on both the interfaces, the listings are exactly the same.
Regional Interfaces are aimed at an audience that does not understand English.

__________________
WinHost Web Hosting