Cache is a temporary storage area or file that a web browser, web server or service provider uses to store commonly accessed pages and graphics which have been recently opened. The cache then enables the visitor’s browser to more quickly reload pages and images that were recently viewed.
Canonical is derived from canon, which means: legitimate or official version – In the case of web site related terms this label is used to describe the correct url for a page. Many times with software driven websites, duplicate urls are created for the same content. So example a page may have serveral versions of the same content with can be sorted and displayed in different ways… Thus creating duplicate content. This term is also used to describe the proper url for domains (IE: WWW or NON-WWW). If your pages load successfully with both and you have not used the rel canonical to describe the correct url, then these pages all have duplicates as well.
Cascading Style Sheets (CSS) is a stylesheet web page language used to describe the presentation or style of a web page or document written in a markup language. CSS is most commonly a set of abbreviated and externally coded styles used to display a web page(s) in a particular manner or style. CSS is most often found in web pages written in HTML and XHTML, however, the language can be applied to any kind of XML document, including SVG and XUL.
CGI is the abbreviated term for Common Gateway Interface. CGI is a program that translates data from a web server and then displaying that data on a web page or in even an HTML email. CGI scripting can add numerous interactive elements to a website, but has become less useful with the newer scripting languages and abilities available.
cgi-bin is a specific directory on a web server where CGI programs are stored and executed..
Advertising providers use their contextual link inventory to match keyword relevant text ads with a page’s content/theme.
Click & Mortar is simply a term that has evolved which refers to a store whose products are available both online and in a regular physical brick and mortar location.
Click Fraud is the illegal/disallowed practice of manipulating Cost-Per-Click (CPC) or Pay-Per-Click (PPC) revenue sharing agreements. There are many different types of click fraud, but most commonly the person who earns the money/revenue from each click of the Ads pays individuals a nominal fee to click those links and earn false revenue. In this scenario the companies end up paying for advertising in which pay for advertising visitors had no intention of buying/converting from them. Companies have recently and in the past filed class action lawsuits against ad publishers alleging that they have failed to aggressively and effectively confront click fraud because they in fact still benefit from increased revenue.
With respect to SEO, cloaking is displaying different content/page to both search engines and searchers. Cloaking may get a site banned from a search engine indexes. While, cloaking has many legitimate purposes which are within search engine quality guidelines, more often than not its use seems to be Black Hat.
CMS is a common acronym referring Content Management System. CMS is a software platform used to help make it easier to update and add information to a website or portal. Joomla, Drupal and WordPress are common CMS platforms.
Code swapping is a form of spam, via a bait and switch. A page is promototed to good organic rankings for its normal good content, then once acheived the content is switched to spam searchers landing on the page with unexpected content.
Comment spam are comments submitted solely for the purpose of placing a link on the blog or website, not in response to content or to contribute anything. Many times these spammed comments are automated if the software is not properly protected.
Contextual Link Inventory or CLI for short is text link advertising that is displayed based on the relevance of surrounding textual content.
