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   W eb browser is the "window to the web" for Internet users around the world. It is a program that enables a user to display and interact with text, images, sound and other information located on a web page of a web site on the World Wide Web. It enables a user to quickly and easily access information provided on the web pages of the web sites by traversing hyperlinks. The two most popular browser are Internet Explorer by Microsoft and Navigator from Netscape. These browsers are used mainly by Windows based computers. Mosaic was a popular browser used by Macintosh users but today the Mac users use the Microsoft Internet Explorer as their default browser. Web Browser History The first widely used web browser was NCSA Mosaic. The Mosaic programming team then created the first commercial web browser called Netscape Navigator, later renamed Communicator, then renamed back to just Netscape. The Netscape browser led in user share until Microsoft Internet Explorer took the lead i...

 The Open System Interconnection (OSI) Model is a conceptual and logical layout that defines network communication used by systems open to interconnection and communication with other systems. The model is broken into seven sub-components, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven layer OSI Model or the seven layer model.  The Seven layers of OSI model are : Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer 1. Physical Layer    The physical layer, the lowest layer of the OSI model, is concerned with the transmission and reception of the  unstructured raw bit stream over a physical medium. It describes the electrical/optical, mechanical, and functiona...