WEB DESIGNING -1BY: A KAMALESH JAYAPANDIARAJ

XI-B-IITDMT

INTRODUCTION• In early days we had only standalone computers. This

confined the user to a single environment and when two people want to exchange information, they had to carry physical data from place to place.• This gave a scope for programmers to make two computers

communicate with each other to form a network.• INTERNET: Collection of computer networks all over the world.

Thousands of computer are connected together through this network.• Information here is exchanged by telephone lines, fibre optic

cables , satellites etc.

• Every computer in this network is called a host.• Each host in the network can be identified uniquely by what is called IP(Internet

Protocol) address.• The IP address is mapped on to DNS which is represented as www.google.com ,

idea of DNS came because IP addresses are just numbers which can not be remembered by most of the people.• Web browsers are software's application that enables a user to display and

interact with there information typically located on web page at a website on the world wide web or local area network.

SERVICES ON THE INTERNET• Lot of field use internet for their development today.• Ex:- Military, Engineering fields, Banking, Medicine etc.• 1. The world wide web : Also called a www or 3w.the collection of all

web pages in all websites on internet is called www. These pages provide us information in the form of text , pictures audio etc.

• 2. E-mail : Email stands for electronic mail.• E-mail was one of the first uses of internet , and quickly became popular

feature because it lets user exchange messages from anywhere in the world. Further is less expensive , saves paper and fast.

• It can be used for lot of purposes.• Benefits : 1. Easy to use

2. Speed 3. Easy to prioritize 4. Reliable and secure

• 5. Informal and conversational• 6. Easier for reference • 7. Automated emails• 8. Environment friendly• 9. Use of graphics • 10.Advertising tool • 11.Cheap service• 12.Data storage• 13.Provision of attachment • The advantages of internet are unlimited and even beyond the scope of author’s

thinking capability. Every concept will have both advantages and disadvantages. But it is important to adopt that if the advantages are more compared to disadvantages .

DISADVANTAGES OF E-MAIL

• The email service, though beneficial in our day-to-day life, has its own drawbacks that are off late coming to the fore.

• Disadvantages of E-mail:-• 1. Viruses: These are computer programs which have the potential to

harm a computer system. Viruses copy themselves and further infect the computer. Recipients need to scan the mails since viruses are transmitted through them and have the potential to harm computer systems.

• 2. Spam: People receive unwanted mails like advertisements etc. Checking and deleting them can consume a lot of time. So it is necessary to keep blocking their sources. Email spoofing is also used for creating spam. Change of mail addresses or headers happen.

• 3.Hacking : • It is one of the most threatening problems faced by

cyber society today. • It is the act of breaking into computer security.• The process of exploiting a network’s security and

accessing unauthorized data illegally.• Separate departments like cyber security police are

formed to stop hackers from doing their job, but they are unsuccessful sometimes.

• E-mail discussion groups: • These are used to discuss different topics with other people by email.• 7.Telnet or remote login : this program is used to access a remote

computer on internet. You can access data and files from connected computer by Telnet. It also provides a UI.

• 8.Chats • 9.Gopher: It is a system for users to search for files using UI.

THANK YOU