If you're trying to find something online, you probably go to search engines like google or yahoo. But, a new website might change the way you get your answers.
Wolfram Alpha is not a search engine, it's an answer engine.
Search engines like Google only give anwsers to questions that have been asked before. For example, if you're searching for IBM and Apple stock information on Google, it will search data that's already available, It tries to find the best match, but it can't figure out anything new.
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Wolfram Alpha is different. Searching on this website won't result in different pages with probable anwsers. This website will actually compute the anwser for you, and display it on one page.
For example, when doing a search for "IBM and Apple" it shows the latest trade numbers, company fundamentals, and even a price history comparison graph of the two companies.
Furthermore, you can search for how much rain Dallas got, compare different countries' statistics,
and enter math formulas and calculations.
But it doesn't have an answer to everything. In fact, searches for things like " Dallas events" turn out into nothing because those answers would be hard to calculate mathematically.
That's why many reviewers say Wolfram Alpha is not a threat to Google or yahoo.
that would just be comparing apples to oranges which of course Wolfram Alpha can do.