A Few Commonly Used Terms

Bounce Rate- Number (in percentage)  of visitors who leaves after viewing single page.
Geo- Targeting- A method to detect a visitor's locations and providing contents/ads based on that.
Mouse- Trapping- A trick used to trap the visitor inside the site.This is generally done by disabling the BACK button or continuous loading of pop-ups.This helps the publisher to reduce their bounce rate.
Doorway Domain- A domain which is made intentionally to increase page ranking and which guides the visitor to the main site.

Keyword Density- Keywords represented in terms of total indexed words.
Meta Tags- Tags which are used to describe or highlight some particular portion  of a webpage.
Sponsored Search- Search hits which are shown on the result page which are paid by the owner of that particular site.
Splash Page- A page or a short animation which are shown on a website before the home page.Mainly these are for promotional purpose.
Organic Search- Search results which are unpaid and are shown with their relevance with the keyword..
SERP- Search Engine Rating Point.
Web Directories- Organised and categorized listing of websites.