Visual results and images take center stage letting users to quickly find what you’re looking for, therefore the search process is straightforward taking less time. 

User eyes can quickly pick up the differences amongst search results based on smart captions and image previews, so that the first tap or click into a result yields just what you’re looking for. 

explained on Search Blog that while user can still rely on the Bing web experience in Internet Explorer, developers optimized the Bing app to run smoother on Windows 8. 

Bing is available on almost all of the Windows markets and languages.