Crawler (also Spider, Robot or Bot):

• Component of a search engine that gathers listings by automatically trolling the Web and following links to webpages.  It makes copies of the webpages found and stores them in the search engine’s index.

The faster the crawlers work, the faster the pages are indexed and show up in search engine results pages.

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Glossary Definition From ABC’s of Online Marketing by Alexandra Wharton, Issue 22, Revenue Magazine

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Pay Per Impression (PPI):

• An advertising pricing model in which advertisers pay based on how many users were served their ads.

This isn’t used as often since there can be third party interference in counting impressions.  I’ve been told that search engine crawlers can interfere with the impressions, although I’m honestly not sure how accurate that is.

If you know a program that uses PPI, share!

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Glossary Definition From ABC’s of Online Marketing by Alexandra Wharton, Issue 22, Revenue Magazine

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