Internet –INTERnational NETwork is the network of computer networks. It is a Wide Area Network(WLAN).You can have unlimited access to internet. The most used feature of Internet is World Wide Web (WWW) WWW stores millions of web pages on web servers. These pages can contain Text, pictures, movies, animation and sound. Web pages are written in a language or code called HTML(Hyper Text Markup Language). A set of web pages is called a web site
Each web page has its own Unique address or URL(Uniform Resource Locator) Web pages are connected by Hypertext links. When a link is clicked you will be taken to another page which could be on another server in any part of the worlk
To connect to the internet you need: A Computer A Telephone line A modem-the type of modem you use depends on the type of connection you have. ◦ Eg. Dial-up, ISDN, DSL, Cable modem An account with an ISP(Internet Service Provider) Browser software
ISP ◦ ISPs are the companies who provide you with access to Internet Browser ◦ A browser is a program that allows you to view the pages written using HTML on the web using hyperlinks ◦ The most widely used browser is Internet Explorer Search Engine ◦ A search engine is a service which helps you find the information you want on the internet ◦ Commonly used search engines are Google, Yahoo
It can be accessed from anywhere. Greater amount of information is available. It can be used to send and receive instant electronic messages ( ) Information is easy to find using Search Engines. It can be accessed from any computer linked to the internet Sounds, pictures, video clips may be available It can be used to sell goods to a world-wide market
Too much information available. Search Engines return thousands of links. So it may be difficult to find exactly what is wanted. Data may not be secure if transferred over internet Many viruses are spread using internet
Intranet- INTernal Restricted Access NETwork It is usually a Local Area Network(LAN). An intranet is a website located on a private network within an organization. It has password controlled pages and it is only for the use of members of that organization. Browsers are used to display web pages which have hyperlinks to other pages. E.g. A school may have an intranet which pupils can access for information from any networked computer. No body outside the school can look at the intranet
Advantages: ◦ Easy communication between the users. ◦ Intranet is better protected for use of /from viruses/from hackers. ◦ No wastage of time looking through millions of resources. ◦ An intranet is free because it does not involve phone links ◦ Information can be easily updated and shared inside a company or school. Disadvantages: ◦ Information cannot be shared outside the local network