I want to know the answer to the following question:
What search engine was added in Windows 8.1?
All the background I'm provided with is that "Windows 8's stock apps were also updated, a new Bing-based unified search system was added, SkyDrive was given deeper integration with the operating system, and a number of new stock apps, along with a tutorial, were added.". Is that enough to answer the question?
Answer: yes