Search Engine Optimization (SEO) Glossary

Definitions to the terms used to describe actions and event in the world of Search Engine Marketing.

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OOP (Over Optimization Penalty)
A theory that applies if one targets only 1 keyword or phrase, and the search engines view the linking efforts to be spam.
Opt-In
When a user willing joins a subscription to a newsletter or some other service.
Outbound Link
A link from your site to any other site.
Off-Page Factors
Factors that alter search engine positions that occur externally from other website's. By having many links from other sites pointing to yours is an example of Off-Page Factors.
On-Page Factors
Factors that determine search engine positions that occur internally within a page of a website. This can include site copy, page titles, and navigational structure of the site.
Organic Listing
The natural results returned by a search engine.
Orphan Page
A page that has a link to it, but has no links to any other sites.
OpenRank (Open Source PageRank)
A suggestion to make a web-wide ranking system as opposed to Google's Pagerank.