How large the site is (in pages).
The age of the site/page.
Whether it is a main domain or a subsidiary domain.
Whether it is a "free Web site" subdomain - ranked lower.
Commercial or not - *.org *.info and *.edu may have more authority than *.com or *.biz.
How many pages link to that page within the site.
The number and importance of the pages/sites linking to that page.
"Demerits" or penalties that the site incurred for promoting itself in ways that that the search engine considers to
be "underhanded" - "Black Hat" SEO.
