History of internet
Internet is a vast network connecting millions of computers. Through internet, the first long distance message was sent to launch the ARPANET on October 29, 1969.
Network is a group of two or more computers linked together. Various types of network include LAN, MAN and WAN. Network device is a component that is used to connect computers so that they can share resources. Modem is a networking device, which converts data from digital computer signals to analog signals.
Tim Berners-Lee invented WWW in 1989. Web pages make the WWW. Web site is a collection of web pages linked together to form a global web of information. Each website has a unique address. This address is called URL. Web server is a computer that hosts a website over the internet. Search engine is a program that searches through a database of web pages for particular information. FTP is a network protocol used to transfer computer files from one host to another host over the internet. FTP works on the client/server principle. Protocol is a standard set of rules for communication. There are two types of e-mail clients: web-based client and stand alone e-mail client. A web-based client appears in a web page, while a stand-alone e-mail client runs on our own computer. The mail client and mail server can exchange information with each other using a variety of protocols. The protocols used with email include IMAP (Internet Message Access Protocol), POP3 (Post Office Protocol 3), SMTP (Simple Mail Transfer Protocol) and HTTP (Hyper Text Transfer Protocol).