Algorithm
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
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.

Alt Tag/Alt Text
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
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.

Anchor Text
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.

Backlinks
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.

Banned
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.

Banner Ad
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
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.

Blacklisted
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.

Broken Link
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
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
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.