Off-page Elements

Elements that are not within the direct control of the web site developer is called as off page elements or factors. They play a bigger role in determining search engine ranking. Search engines are relying more and more on these elements when determining ranking because they are more defiant to spamming or abuse.

On-page Elements

On page elements are those within the direct control of the web site developer and these determine search engine ranking. Examples of on-page factors include META tags, page text, title tag text, site link structure etc.

One-way Links:

the type of links powerful in doing the link popularity are called one way links. These are not reciprocated links i.e. no link exists to the web site that is doing the linking.

Open Directory Project

Open Directory Project is also called DMOZ which is a very large directory run by volunteers. This is used by many websites on the internet.

Open Source

Software which is distributed with its source code such that developers can modify it as they see fit.

On the web open source is a great strategy for quickly building immense exposure and mindshare.

Overture

The original leader in PPC Engines, now owned by Yahoo! Delivers PPC results to many search engines.

Optimization

This term refers to the process of modifying and marketing a website for higher rankings in search engine results.

Outbound Links

Outbound link is a link on your web page that links to another site.

Optimized content

this is the content which has great importance due to the amount and placement of relevant keywords and keyword phrases. Search engines rank sites with optimized content.

Organic Search Results

Most major search engines have results that consist of paid ads and unpaid listings. The unpaid / algorithmic listings are called the organic search results. Organic search results are organized by relevancy, which is largely determined based on linkage data, page content, usage data, and historical domain and trust related data.

Overture Keyword Selector Tool

Popular keyword research tool, based largely on Yahoo! search statistics. Heavily skewed toward commercially oriented searches, also combines singular and plural versions of a keyword into a single version.

Organic Search Listings

Listings that search engines do not sell (unlike paid listings). Instead, sites appear solely because a search engine has deemed it editorially important for them to be included, regardless of payment. Paid Inclusion Content is also often considered "organic" even though it is paid for. This is because paid inclusion content usually appears intermixed with unpaid organic results.

Organic Search Rankings

Search engine ranking of web pages found in SERPs.