A web browser is a software application that enables a user to display and interact with HTML documents hosted by web servers or held in a file system. Popular browsers available for personal computers include Microsoft Internet Explorer, Mozilla, Firefox, Opera, Netscape, Safari and Konqueror. A browser is the most commonly used kind of user agent. The largest networked collection of linked documents is known as the World Wide Web.
Web Server Definition
A web server serves web pages to clients across the Internet or an Intranet. The web server hosts the pages, scripts, programs, and multimedia files and serves them using HTTP, a protocol designed to send files to web browsers and other protocols.
The most common webserver is Apache (available for all major operating systems) though IIS (Internet Information Server - available on the Windows Platform) is a fast growing web server.
Client/Server is a network application architecture which separates the client (usually the graphical user interface) from the server. Each instance of the client software can send requests to a server or application server.
Server-side computing Occurring on the server side of a client-server system. For example, on the World Wide Web, CGI scripts are server-side applications because they run on the Web server. In contrast, JavaScript scripts are client-side because they are executed by your browser (the client). Java applets can be either server-side or client-side depending on which computer (the server or the client) executes them.
Client-Side Computing Occurring on the client side of a client-server system. For example, on the World Wide Web, JavaScript scripts are client-side because they are executed by your browser (the client). In contrast, CGI scripts are server-side because they run on the Web server. Java applets can be either server-side or client-side depending on which computer (the server or the client) executes them.
A hyperlink, or simply a link, is a reference in a hypertext document to another document or other resource. As such it would be similar to a citation in literature. However, combined with a data network and suitable access protocol, it can be used to fetch the resource referenced. This can then be saved, viewed, or displayed as part of the referencing document.
Source code (commonly just source or code) is any series of statements written in some human-readable computer programming language. In modern programming languages, the source code which constitutes a program is usually in several text files, but the same source code may be printed in a book or recorded on tape (usually without a filesystem). The term is typically used in the context of a particular piece of computer software. A computer program's source code is the collection of files that can be converted from human-readable form to an equivalent computer-executable form. The source code is either converted into an executable file by a compiler for a particular computer architecture, or executed on the fly from the human readable form with the aid of an interpreter.
A domain name is a name of a computer on the Internet that distinguishes it from the other systems on the network. They are sometimes colloquially (and incorrectly) referred to by marketers as "web addresses".
DNS Short for Domain Name System (or Service or Server), an Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they're easier to remember. The Internet however, is really based on IP addresses. Every time you use a domain name, therefore, a DNS service must translate the name into the corresponding IP address. For example, the domain name www.example.com might translate to 198.105.232.4.
The DNS system is, in fact, its own network. If one DNS server doesn't know how to translate a particular domain name, it asks another one, and so on, until the correct IP address is returned.
HTTP Short for HyperText Transfer Protocol, the underlying protocol used by the World Wide Web. HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands. For example, when you enter a URL in your browser, this actually sends an HTTP command to the Web server directing it to fetch and transmit the requested Web page.
The other main standard that controls how the World Wide Web works is HTML, which covers how Web pages are formatted and displayed.
HTTP is called a stateless protocol because each command is executed independently, without any knowledge of the commands that came before it. This is the main reason that it is difficult to implement Web sites that react intelligently to user input. This shortcoming of HTTP is being addressed in a number of new technologies, including ActiveX, Java, JavaScript and cookies.
An IP address (Internet Protocol address) is a unique number, similar in concept to a telephone number, used by network devices (routers, computers, time-servers, FAX machines, some telephones) attached to a network to refer to each other when sending information through a LAN (Local Area Network), WAN (Wide Area Network) or the Internet for example. This allows devices passing the information onwards on behalf of the sender to know where to send it next, and for the device receiving the information to know that it is the intended destination.
An example IP address is 207.142.131.236. Converting a number address to a more human-readable form called a domain address (www.wikipedia.org) is done via the Domain Name System. The process of conversion is known as resolution of the domain name.
A Uniform Resource Locator, URL (properly pronounced as a spelled-out initialism, not syllabalized as 'earl'), or Web address, is a standardized address name layout for resources (such as documents or images) on the Internet (or elsewhere). First created by Tim Berners-Lee for use on the World Wide Web, the currently used forms are detailed by Internet standard RFC 1738. It is also known as Universal Resource Locator [1],[2],[3].
The URL was a fundamental innovation in the history of the Internet. The syntax is designed to be generic, extensible, and able to express addresses in any character set using a limited subset of ASCII characters (for instance, whitespace is never used in a URL). URLs are classified by the "scheme" which typically identifies the network protocol used to retrieve the resource over a computer network.
The Image Tag
In HTML, images are defined with the IMG tag.
The IMG tag is empty, which means that it contains attributes only and it has no closing tag.
To display an image on a page, you need to use the src attribute. Src stands for "source". The value of the src attribute is the URL of the image you want to display on your page.
A stub is an article which is clearly too short, but not so short as to be useless. In general, it must be long enough to at least define the article's title. This generally means 3 to 10 short sentences. Note that a longer article may be a stub if the topic is complex enough; conversely, a short article on a topic which has a very narrow scope may not be a stub.
The Refresh command refreshes (goes back to the server for new data) the contents of the current item displayed by SQL Manager.
