LAN: It stands for local area network. It is an interconnection of computer systems through one type of transmission medium and is entirely contained in a building or two. It is relatively a small network typically personal to an organization. The maximum limit is ten kilometer in size.

WAN: Its stands for wide area networking. It is a larger network. It covers the whole universe of computer communication. A WAN may be interconnecting LAN’s separated by large distances spanning the regional, national, or global areas. Generally WAN’s use satellite as the primary transmission on media and therefore, the transmission is comparatively costly

E-MAIL (ELECTRONIC MAIL): sending and receiving letters, data, files through a network using communication lines, is called E-Mail. The sender and receiver must have a e-mail identity which is provided by the different internet service providers. SMTP (simple mail transfer protocol) helps the user to sent mail to and receives mail from other network. E-mail ID is of type user.
name@host.name

WWW (World Wide Web): It is a graphical, colorful, user friendly interface to the internet. It is a line mode hypertext browser that can scan through hyperlinked data basic. Which spreads over whole of the world? It allows the user to browse information across the internet without the necessity to login. User types the site address on the web and browser displays the home page. For example, if the page is lying on the site having; address.

DATA FLOW DIAGRAM: Internet is the networks consisting of thousands networks spanning the entire globe. Internet is an internal company network base on the same technology as the internet. An internet work like a web site. Except that it’s available only to that user who can access the network.

INTERNET AND INTRANET: Internet is the networks consisting of thousands of networks spanning the entire globe. Where intranet is an internet is an internal company network based on the same technology as the internet. An intranet work like a web site except that its available only to those user who can access the network.

WEB SITE: is the location on the World Wide Web (WWW) where information’s are stored as web pages hyperlinked to other pages of that WEB SITE.

FTP: file transfer protocol

GATEWAY: the route to access internet to connect to the web sites.