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Letter C


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CAPTCHA (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used in computing to determine whether or not the user is human.

Last Revised: 2015-09-07


In email, a carbon copy (abbreviated CC) is a copy of an email sent to an addressee other than the main addressee. All recipients are aware (unlike BCC) of the others also emailed.

Last Revised: 2015-10-15


A content delivery network (CDN) is a system of distributed cache servers (network) that deliver webpages and other Web content to a user based on the geographic locations of the user, the origin of the webpage, and a content delivery server. The goal of a CDN is to serve content to end-users with high availability and high performance. CDNs serve a large fraction of the Internet content today, including web objects (text, graphics and scripts), downloadable objects (media files, software, documents), applications (e-commerce, portals), live streaming media, on-demand streaming media, and social networks.

Last Revised: 2015-10-05


CFML is a tag-based Web scripting language supporting dynamic webpage creation and database access in a Web server environment. In the language, ColdFusion tags are embedded in HTML files.

Last Revised: 2015-09-20


CGI, or Common Gateway Interface, is the standard programming interface between Web servers and external programs. It is one of the most exciting and fun areas of programming today. The CGI standard lets Web browsers pass information to programs written in any language.

Last Revised: 2015-07-01


CMS (content management system) is a web application designed to make it easy for non-technical users to add and edit content to a website, and manage a website.

Last Revised: 2015-09-08


Cookies are usually small text files, given ID tags that are stored on your computer's browser directory or program data subfolders. Cookies are created when you use your browser to visit a website that uses cookies to keep track of your movements within the site, help you resume where you left off, remember your registered login, theme selection, preferences, and other customization functions. The website stores a corresponding file(with same ID tag)to the one they set in your browser and in this file they can track and keep information on your movements within the site and any information you may have voluntarily given while visiting the website, such as email address.

Cookies are often indispensable for websites that have huge databases, need logins, have customizable themes, other advanced features.

Cookies usually don't contain much information except for the url of the website that created the cookie, the duration of the cookie's abilities and effects, and a random number. Due to the little amount of information a cookie contains, it usually cannot be used to reveal your identity or personally identifying information.However, marketing is becoming increasingly sophisticated and cookies in some cases can be agressively used to create a profile of your surfing habits.

There are two types of cookies: session cookies and persistent cookies. Session cookies are created temporarily in your browser's subfolder while you are visiting a website. Once you leave the site, the session cookie is deleted. On the other hand, persistent cookie files remain in your browser's subfolder and are activated again once you visit the website that created that particular cookie. A persistent cookie remains in the browser's subfolder for the duration period set within the cookie's file.

Last Revised: 2015-08-30


cPanel is a web-based graphical control panel available on some servers. It lets you easily manage many aspects of your hosting account and web server / website.

Last Revised: 2015-09-12


CPU is the abbreviation for Central Processing Unit. Sometimes referred to simply as the central processor, but more commonly called processor, the CPU is the brains of the computer where most calculations take place.

Last Revised: 2015-09-24


A crawler is a program that visits websites, and reads their pages and other information in order to create entries for a search engine index. The major search engines on the Web all have such a program, which is also known as a "spider" or a "bot". Crawlers are typically programmed to visit sites that have been submitted by their owners as new or updated. Entire sites or specific pages can be selectively visited and indexed. Crawlers apparently gained the name because they crawl through a site a page at a time, following the links to other pages on the site until all pages have been read.

Last Revised: 2015-10-15


Cron is a time-based job scheduler in Unix-like computer operating systems. People who set up and maintain software environments, use cron to schedule jobs (commands or shell scripts) to run periodically at fixed times, dates, or intervals. It typically automates system maintenance or administration - though its general-purpose nature makes it useful for things like connecting to the Internet and downloading email at regular intervals. Cron is most suitable for scheduling repetitive tasks. Scheduling one-time tasks is often more easily accomplished using the associated at utility.

Last Revised: 2015-09-11


CSS or Cascading Style Sheets. Style sheets give you huge control over your design, and with a few small changes, you could change the look of your whole site. They are added between <head> and </head> tags in the HTML as this:

<link rel="stylesheet" href="/css/styles.css">

You can also add CSS inline within a page, but this is not recommended.

CSS style sheet files have the .css file extension.

Last Revised: 2015-07-01


The practice of abusing trademarks within the domain name system. Brand names - spelled correctly or, in a practice known as typosquatting, spelled incorrectly - are used within a domain name, enabling the squatter to divert web traffic meant for a legitimate site to an illicit site which may sell counterfeit goods, utilize pay-per-click abuse, host adult content or conduct other illicit activity.

Last Revised: 2015-10-03

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