Monday, November 16, 2009

SEO Dictionary (Part - 1)

An algorithm is a set of finite, ordered steps for solving a mathematical problem. Each Search Engine uses a proprietary algorithm set to calculate the relevance of its indexed web pages to your particular Query. The result of this process is a list of sites ranked in the order that the search engine deemed most relevant. Search engine algorithms are closely guarded in order to prevent exploitation of algorithmic results. Search algorithms are also changed frequently to incorporate new data and improve relevancy.
Algorithmic results are the ranked listings search engines provide in response to a Query. They are often referred to as Organic Listings in contrast to Paid Listings because their rank is based on relevancy rather than advertising revenue paid to the search engine. However, paid listings do appear alongside algorithmic results in many search engines, provided they are relevant. Improving a website’s unpaid algorithmic results is known as Natural Search Engine Optimization.

An alt tag is the HTML text that appears while an image is loading or when a cursor is positioned over an image. Alt text is useful in Search Engine Optimization because it can include keywords that a search engine looks for in response to a query.
Analytics refers to all the technology, programming, and data used in Search Engine Marketing to analyze a website’s performance or the success of an Internet marketing campaign.

Also known as link text, anchor text is the visible, clickable text between the HTML anchor and tags. Clicking on anchor text activates a Hyperlink to another web site. Anchor text is very important in Search Engine Optimization because search engine algorithms consider the Hyperlink keywords as relevant to the Landing Page.
Also known as back link, backward link, or inbound links, backlinks are all of the links on other websites that direct the users who click on them to your site. Backlinks can significantly improve your site’s search rankings, particularly if they contain Anchor Text keywords relevant to your site and are located on sites with high Page Rank.

Also known as delisted or blacklisted, a banned site is a URL that has been removed from a search engine’s Index, typically for engaging in Black Hat SEO. Banned sites are ignored by search engines.
A banner ad is a rectangular graphic advertisement. Banner ads are one of the commonest forms of online advertising. Their sizes vary, but most measure 468 pixels wide by 60 pixels high. Clicking on a banner ad will direct you to the advertiser’s website or a designated Landing Page.

Black hat SEO is the term used for unethical or deceptive optimization techniques. This includes Spam, Cloaking, or violating search engine rules in any way. If a search engine discovers a site engaging in black hat SEO it will remove that site from its Index.

Also known as banned or delisted, a blacklisted site is a URL that has been removed from a search engine’s Index, typically for engaging in Black Hat SEO. Blacklisted sites are ignored by search engines.

Also known as a dead link, a broken link is a link that no longer points to an active destination or Landing Page. Search engines dislike broken links. Keeping all of your site’s links active is an important part of ongoing optimization.


Click Fraud is the illegal practice of manipulating Cost-Per-Click (CPC) or Pay-Per-Click (PPC) revenue sharing agreements. There are numerous types of click fraud, but in a typical scenario the webmaster of a site that earns money from each click of the advertising links it publishes pays individuals a small fee to click those links. Companies thus pay for advertising to clients who had no intention of buying from them. Some companies have filed class action lawsuits alleging that ad publishers such as Google and Yahoo! have failed to aggressively confront click fraud because they benefit from increased CPC revenue.

Click-through refers to a single instance of a user clicking on an advertising link or site listing and moving to a Landing Page. A higher Click-Through Rate (CTR) is one of the primary goals of Search Engine Optimization.

Click-through rate is the percentage of users who click on an advertising link or search engine site listing out of the total number of people who see it, i.e. four click-throughs out of ten views is a 40% CTR.

Cloaking is the presentation of alternative pages to a search engine Spider so that it will record different content for a URL than what a human browser would see. Cloaking is typically done to achieve a higher search engine position or to trick users into visiting a site. In such cases cloaking is considered to be Black Hat SEO and the offending URL could be Blacklisted. However, cloaking is sometimes used to deliver personalized content based on a browser’s IP address and/or user-agent HTTP header. Such cloaking should only be practiced with a search engine’s knowledge or it could be construed as black hat cloaking.

Search engines/advertising networks use their contextual link inventory to match keyword-relevant text-link advertising with site content. CLI is generated based on listings of website pages with content that the ad-server deems a relevant keyword match. Ad networks further refine CLI relevancy by monitoring the Click-Through Rate of the displayed ads.

Conversion is the term used for any significant action a user takes while visiting a site, i.e. making a purchase, requesting information, or registering for an account.

Conversion analytics is a branch of Analytics concerned specifically with conversion-related information from organic and paid search engine traffic, such as the keywords converts used in their queries, the type of conversion that resulted, landing page paths, search engine used, etc.


Conversion rate is the next step up from Click-Through Rate. It’s the percentage of all site visitors who “convert” (make a purchase, register, request information, etc.). If three users buy products and one user requests a catalogue out of ten daily visitors, a site’s conversion rate is 40%.
Cost-per-acquisition (CPA) is a return on investment model in which return is measured by dividing total click/marketing costs by the number of Conversions achieved. Total acquisition costs ÷ number of conversions = CPA. CPA is also used as a synonym for Cost-Per-Action.


In a cost-per-action advertising revenue system, advertisers are charged a Conversion-based fee, i.e. each time a user buys a product, opens an account, or requests a free trial. CPA is also known as cost-per-acquisition, though the term cost-per-acquisition can be confusing because it also refers to a return on investment model.
Also known as pay-per-click or pay-for-performance, cost-per-click is an advertising revenue system used by search engines and ad networks in which advertising companies pay an agreed amount for each click of their ads. This Click-Through Rate-based payment structure is considered by some advertisers to be more cost-effective than the Cost-Per-Thousand payment structure, but it can at times lead to Click Fraud.
Also known as cost-per-impression or CPM for cost-per-mille (mille is the Latin word for thousand), cost-per-thousand is an advertising revenue system used by search engines and ad networks in which advertising companies pay an agreed amount for every 1,000 users who see their ads, regardless of whether a click-through or conversion is achieved. CPM is typically used for Banner Ad sales, while Cost-Per-Click is typically used for text link advertising.


Also known as Spider or Robot, a crawler is a search engine program that “crawls” the web, collecting data, following links, making copies of new and updated sites, and storing URLs in the search engine’s Index. This allows search engines to provide faster and more up-to-date listings.

Also known as banned or blacklisted, a delisted site is a URL that has been removed from a search engine’s Index, typically for engaging in Black Hat SEO. Delisted sites are ignored by search engines.

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