I learned that search engines are programs where people can type keywords, and a list of documents will come back with that keyword in them. More than 80% of website visitors use search engines. Search engines give a list of the best content that is relevant to the keywords you are looking for. Search engines help rank pages in order of relevance.
The most popular search engines are:
- Yahoo!
- Bing
- Ask
- AOL
Directories
Directories are similar to search engines. They give you a list of results, but these results are organized by human editors. Directories come up with keywords by using the site name, domain, and a description of the site. They are usually groups of pages of related content.
Two ways that search engines rank pages:
1) Crawler based search engines- scans and indexes pages
2) Human powered directories- manual listing done by humans
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