The Internet, The Web and Electronic Commerce

URL is Uniform Resource Locator that specifies where an identified resource is available and the mechanism for retrieving it. In popular usage and in many technical documents and verbal discussions it is often incorrectly used as a synonym for URI. The best-known example of the use of URLs is for the addresses of web pages on the World Wide Web. The format is based on Unix file path syntax, where forward slashes are used to separate directory or folder and file or resources names.

HTML is a computer language devised to allow website creation. These websites can then be viewed by anyone else connected to the Internet. It is relatively easy to learn with the basics being accessible to most people in one sitting; and quite powerful in what it allows you to create. HTML consists of a series of short codes typed into a text-file by the site author. The text is then saved as a html file, and viewed through a browser like Internet Explorer. This browser reads the file and translates the text into a visible form, hopefully rendering the page as the author had intended.

Javascript also known as ECMAScript is a prototype based, object orientedm scripting language that is dynamic, weakly typed and has first class funtions. It is also considered a functional programming language.

JavaScript is an implementation of the ECMA script language standard and is primarily used in the form of client side Javascipt, implemented as part of a web browser in order to provide enhanced user interfaces and dynamic websites. This enables programmatic access to computational objects within a host environment.

An applet is a program written in the Java programming language that can be included in an HTML page, much in the same way an image is included in a page. When you use a Java technology-enabled browser to view a page that contains an applet, the applet's code is transferred to your system and executed by the browser's Java Virtual Machine (JVM). For information and examples on how to include an applet in an HTML page, refer to this description of the "applnet" tag. Java applets run at a speed that is comparable to  other compiled languages,but many times faster than Javascrpt.

A blog  is a personal online journal that is frequently updated and intended for general public consumption. Blogs are defined by their format: a series of entries posted to a single page in reverse-chronological order.Blogs generally represent the personality of the author or reflect the purpose of the Web site that hosts the blog. Topics sometimes include brief philosophical musings, commentary on Internet and other social issues, and links to other sites the author favors, especially those that support a point being made on a post.

Wiki is a piece of server software that allows users to freely create and edit Web page content using any Web browser. Wiki supports hyperlinks and has a simple text syntax for creating new pages and crosslinks between internal pages on the fly. Wiki is unusual among group communication mechanisms in that it allows the organization of contributions to be edited in addition to the content itself. Like many simple concepts, "open editing" has some profound and subtle effects on Wiki usage. Allowing everyday users to create and edit any page in a Web site is exciting in that it encourages democratic use of the Web and promotes content composition by nontechnical users.

 

 

File Transfer Protocol (FTP) is a standard network protocol use to copy a file from one host to another over a TCP-based network, such as the Internet. FTP is built on a client-server architecture and utilizes separate control and data connections between the client and server. FTP users may authenticate themselves using a clear-text sign-in protocol but can connect anonymously if the server is configured to allow it.

The first FTP client applications were interactive command-line tools, implementing standard commands and syntax. Graphical user interface clients have since been developed for many of the popular desktop operating systems in use today.

A plug-in (or plugin) is a set of software components that adds specific abilities to a larger softwareapplication. If supported, plug-ins enable customizing the functionality of an application. For example, plug-ins are commonly used in web browsers to play video, scan for viruses, and display new file types. Well-known plug-ins examples include Adobe Flash Player and QuickTime. Extensions differ slightly from plug-ins. Plug-ins usually have a narrow set of abilities. For example, the original impetus behind the development of Mozilla Firefox was the pursuit of a small baseline application, leaving exotic or personalized functionality to be implemented by extensions to avoid feature creep.

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