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How to these search pages work?
Well, do you really want to know. REALLY? OK, the short answer is that they work by magic. That's all you need to know. But, if you really want the long answer, here it comes. There are two main types of search site. Both types set up huge indexes which relate keywords to pages on the World Wide Web. They differ in how they obtain their information. The first type, such as Alta Vista, attempt to index all of the pages in the world. This is done automatically using something called a spider. Spiders are sort of electronic robots which roam about the Internet, looking for World Wide Web pages. When a spider finds a page, it reads it, finds any interesting keywords and takes this information back home with it to be indexed. The second type of search page only lists selected sites. Yahoo is an example of this. This type of search page is more like a catalogue. If you have written some World Wide Web pages, you can submit them to these type of search sites for indexing. |