SEARCH ENGINE: A program that searches documents for specified keywords and returns a list of the documents where the keywords were found.

ALGORITHM: An algorithm is the formula on the basis of which the Crawler will crawl the pages of web sites.

DIRECTORY: A list of sites compiled by humans. For instance, Yahoo.

SPIDER: A spider goes to your website and finds your pages. It then stores those pages in a database for future retrieval by the search engine.

INDEXING: When the search engine takes the pages from the database that the spider has created and places them in an order based on the algorithms of that engine.

QUERY: The keywords that a person types into a search box.

CRAWLING: When the spider follows the links from the page you submit.

AUTOMATIC UPDATE: When the spider returns to your pages at periodic intervals to check to see if you’ve made any changes.

OPTIMIZING: You can optimize, tune or configure your web pages for a specific search engine. This means you are employing specific strategies for specific engines.

SPAM: Using the same keyword more than three times in your keywords tag. Putting keywords into your tags that have nothing to do with your actual page content. Using text, spacers, or borders the same color as the background. Using tiny text keywords in an attempt to increase ranks.

Keyword: Related Word that we put in search box to search.

Bot: Abbreviation for robot (also called a spider). It refers to software programs that scan the web. Bots vary in purpose from indexing web pages for search engines to harvesting e-mail addresses for spammers.

Anchor Text: Anchor text refers to the visible text for a hyperlink. For example: <a href="http://www.ecodesolution.com">This is the anchor text</a >

Back Link: Any link on another page that points to the subject page. Also called inbound links or IBLs

CPC: Abbreviation for Cost Per Click. It is the base unit of cost for a PPC campaign

PFI: Abbreviation for Pay For Inclusion. Many search engines offer a PFI program to assure frequent spidering / indexing of a site (or page). PFI does not guarantee that a site will be ranked highly (or at all) for a given search term. It just offers webmasters the opportunity to quickly incorporate changes to a site into a search engine's index. This can be useful for experimenting with tweaking a site and judging the resultant effects on the rankings

PPC: Abbreviation for Pay Per Click. An advertising model where advertisers pay only for the traffic generated by their ads.

PR: Abbreviation for Page Rank - Google’s proprietary measure of link popularity for web pages. Google offers a PR viewer on their Toolbar.

SEM: Abbreviation for Search Engine Marketing. SEM encompasses SEO and search engine paid advertising options (banners, PPC, etc.)

SEO: Abbreviation for Search Engine Optimization. SEO covers the process of making web pages spider friendly (so search engines can read them) making web pages relevant to desired key phrases.

Spider : Also called a bot (or robot). Spiders are software programs that scan the web. They vary in purpose from indexing web pages for search engines to harvesting e-mail addresses for spammers

ROI: Return on Investment. what the returns (generally sales revenue) were for the money expended (invested).

CPA: Cost Per Action is the cost the advertiser pays to the site publisher each time a specific, visitor-initiated action occurs, e g, the completion of a sale

CPM: Cost per thousand impressions. CPM refers to the total cost of 1,000 visitor requests to view an ad; in other words, the cost for 1,000 impressions

CPC: Cost Per Click. The cost the advertiser pays to the site publisher each time a visitor clicks on the advertiser's ad

ODP: Open Directory Project like DMOZ (Directory Mozilla) is a multilingual open content directory of World Wide Web links

Link Popularity: It means how many links you got on that search engine.

LPC (Link Popularity Checker) is the tool used to check link popularity of a site.

Incoming Links: links coming in our site from other sites.

Outgoing Links: links others getting from our site

Blind Traffic: (SPAM) is the increment of traffic in unnatural way

Clustering: means indexing both home page and service page with description

Keyword Density: The ratio of the number of occurrences of a particular keyword or phrase to the total number of words in a page. One element of search engine optimization

Keyword Prominence: Describes how high a keyword is found on a web page. The higher the keyword is, the more weight it is given by the search engine because the more important words of a web page are generally placed near the top of the page

Keyword Frequency: It is how often a keyword appears on a page and in specific areas on a page.

Page Rank: Page Rank is basically Google's method of measuring a page's importance.

Cloaking: An unethical SEO practice. It involves a different version of a web page being presented to each search engine spider. Each different version of the web page is optimized for the search engine spider it is presented to (i.e. exploiting its weaknesses). For example the Yahoo spider will be presented with a web page optimized for the Yahoo spider. You can be penalized heavily by the search engines for doing it, so don't do it.

Natural Links: Links pointing to a web site created because someone found the web site useful and decided to link to it i.e. linked to it naturally. These types of link are very powerful in the link popularity stakes as they identify a web site that is worth linking to and therefore has a better chance of being a quality resource of information. To increase your chances of earning natural links make sure your web site has a lot of quality content that is better than the competition. Also provide linking information on your web site to make it easier to link to i.e. provide actual HTML to use when linking.

Off-page Elements: The opposite of on-page elements. Elements that are outside the direct control of the web site developer and are influential in determining search engine ranking. Examples of off-page elements are links pointing to a web site and anchor text in links pointing to web site. However web site developers still have some degree of control over these elements for example directory submissions. Search engines are relying more and more on these elements when determining ranking because they are more resistant to spamming/abuse.

On-page Elements: The opposite of off-page elements. Elements that are within direct control of the web site developer and are influential in determining search engine ranking. Examples of on-page elements are META tags, page text, title tag text, site link structure etc... These elements are prone to keyword spamming and other similar forms of abuse so the search engines do not look to them as much as off-page elements when determining ranking.