Session3 Internet/WWW

The Internet and World Wide Web
The Internet has revolutionized many aspects of our daily lives. It has changed the way we communicate and gain information.
The Internet is an infrastructure that has developed in 1960’s by American military as an electronic communication technology. By using the Internet, We can share information, data, knowledge and files. A network that connect individual computers in same environment and allows them to share resources is called Local Area Network or LAN. Connection between LANs create wider network and this is know as WAN. The Internet is a world wide network which is organized by these local or wide area networks.
World Wide Web is one of the services which is available over the Internet. While it has developed in 1990’s as a service that allows people in academia, it has become more common and widely used among ordinary people as it allows them to exchange many kinds of data.

Server computer and Client computer
There are two types of computers; one is server computers which are high powered computers. They receive and process request from client computers. Other one is client computers which send request and receive result. Server computer is run by a program called HTTP deamon which enable them to process requests that have been made by client machines and send information to them. Client computers use web browsers such as FireFox and Internet explore to send request to server computers.

HTML
Hypertext Mark-up Language or HTML is a set of special tags that allows users to identify the structure of web pages.　The important point is that HTML is designed to control only structure (and the presentation of a web page is controlled by CSS). From this point of view, some tags such as em, hr and br might not be eligible to be used as HTML tag.

activity in practical lab
I set up a web site on my student home page at City