Another cool tool checks to see if viruses have infected your machine. Before you start looking for anything on the Net, you need to decide whether you want specific or general information. A search engine will give you a more narrowed down search. It uses robots, or spiders, which are little computer programs that crawl around and scan every web page. I doubt it.
Directories are something different.
They're more like a card catalog which you'll find in your local library. Actual human beings have to look at every page that directories catalog. It even includes the Broadway musical, Cats. But, I happen to be looking for a specific cat, and these sites about cats may or may not have the results. To find out, I'd have to read through every one of them that seemed to apply.