I believe that would be Google drive?
What is the question please explain more
The answer is : (Review Tab | Proofing group)
It usually use to proof reading your file and detect if there's any grammar mistakes in the file.
Current's excel technology is still not capable to detect 100 % of the mistakes though
2 that’s because some people will buy it because they think the value of it is good and some might not because they believe it is too expensive.