Thibaultmol You are very correct in that autocomplete is a similar feature that helps people make a better query. I use it a lot, but it's not always sufficient. Especially in cases where people for example are looking for something that they don't know the word for - which is fairly often the use case of a search engine.
Let me give you an example: Let's say your Kagi region is Brazil, and you're reading an old book about the far east. You read that the Chinese emperor sent out surveyors to map Formosa. If you wonder where Formosa is, Kagi won't give you easily a good result. Neither will Google. Because the word means "Beautiful", and there's a hundred other things with that name, including places outside of Asia.
The search suggestion at Kagi.com very helpfully suggests the land Formosa and you find out that it is Taiwan, but if you're searching from the URL bar in the browser, your search suggestions might come from Google, Bing, or Yahoo. Here is what Yahoo suggests me for "Formosa":
If you don't know whether Formosa is a country, a province, a city, or a kingdom then it might be difficult to make the correct query. Not impossible, of course. But there are regions, cities and provinces outside of Asia with that name.
But these keywords would also be useful even for simple queries, when you want only the results pertaining to the thing you were looking for. Such as the example with "vacuum".
Or if you have to make searches in languages you don't understand at all, then these keywords could be very helpful. For example when planning a trip abroad, or doing research.
