computer world

  What is CSS  Cascading style sheet (CSS) is a way to control the look and feel of your HTML document in an organized and efficient manner. Cascading style sheet is a standard Defined by the world wide web consortium that offers designers more flexibility and accuracy when defining the appearance of text and formats than standard HTML.  Cascading style seat(CSS) is a way to control the look and feel of your HTML document in an organized and efficient manner. Essentially, CSS allows designers to manipulate the appearance of the web page without affecting its HTML structure.  Cascading style sheets, is a simple design to language to simplify the process of making web page presentable. CSS handle the look and feel part of a web page. Using CSS you can control the color of the text , the style of font, the spacing between paragraph, how column are sized and lied out, what background image or color are used , as well as variety of other effects.  CSS is easy to learn and understand but it

Introduction to HTML     HTML is the building block for web page. Hyper Text Markup language is the central core on which all web pages are built. HTML was invented by Tim Berbers-Lee. HTML is a language for describing web pages. HTML stands for Hyper Text Markup language. HTML is not a programming language, it is a markup language. A markup language is a set of markup tags. The purpose of the tags are to describe page content. HTML is the language interpreted by browser. web page are also called HTML documents. HTML is a set of special codes that can be embedded in text to add formatting and linking information. HTML is specified as TAGS in an HTML documents. Basically an HTML document is a plain text file that contains text and nothing else. When a browser opens an HTML file the browser will took for HTML code in the text and interprets them in to graphical layout. As HTML document are text file they can be written in even the simplest text editor.  There are many popular HTML Editor

What is internet The internet is a network of networks that connects computers all over the world.  Computer connected to the internet communicate by using the internet protocol, which slice information into packets that is chunks of data to be transmitted separately and routes them to their destination. The internet has its roots in the US military, which founded a network in in 1969  called the ARPANET, to connect the computers at the some of the colleges and Universities where military research took place. As more and more computer connected, the ARPANET was replaced by the NSFNET, which was run by the National Science Foundation. By the late of 1980 the internet has shed its military and the was available for use by the general public.  internet service providers begin offering dial up internet accounts for a monthly fee, giving users access to email and file transfer. In 1989, the world wide web was born and in the 1990, the combination of email and web. Each computer on the inter

 Demand paging   consider how an executable programs might be loaded from disk into memory. One option is to load the entire program in physical memory at program execution time. However a problem with this approach is that we may not initially need the entire program in memory. Suppose a program start with a list of available options from which the user is it to select. Loading the entire program into memory results in loading the executable code for all option, regardless of whether an option is ultimately selected by the user or not . An alternative strategy is to load page only as they are needed. This technique is known as demand paging and is commonly used in virtual memory system.  when we want to execute a process, we swap it into memory. Rather then swapping the entire process into memory, however we use a lazy swapper. A lazy swapper never Swap a page into memory  unless that page will be needed. Since we are now viewing a process as a sequence of pages, rather than as one la