Introduction:

One of the most innovative discoveries of science in the development of human civilization is Internet. The world's first communication network is the breakthrough of the communication system. This is a computer based communication system. Due to the fast communication system established on the Internet, the countries of the world today are close neighbors. This system has made the concept of 'Global Village' a reality. Internet is currently being widely used for multicultural purposes. Modern electronics technology has made huge potential for human welfare.

Internet Key:

The International Network (International Fake) is a short form of the word Internet. This system is a popular way of international communication. This system has been developed as a system of computer networks. Internet communication system has been developed by adding computers in different countries in a special way. Through this system of computer based system, all information can be collected and sent from any corner of the world. Millions of subscribers, including hundreds of thousands of world-class educational institutions, laboratories, news agencies, business organizations, have joined this internet connection with the help of the Internet. Connecting to the Internet, computers, mobile phones or any similar device can collect information at the moment. For this, computers or similar devices, modems and internet connections.

Internet origins:

The discovery of the modern times of the Internet. In 1969 the US Defense Department discovered it. As the secret and communication medium of communication, it is a substitute for telephony in the Defense Department's laboratory. It is a communication method based on telephone lines. When the desktop computer is discovered, the computer is connected to Telnetwork. Then its name was ARPANET. Once upon a time, the network has changed greatly through artificial satellites. In the 1990s, the internet spread widely in the world. The use of optical fiber has played an important role in the revolution of the Internet.

Internet Expansion:

The US Department of Defense started the process of connecting 4 computers, and in the next three years it increased to 36. In 1984, the US National Science Foundation introduced a system for public use. Then in a short time it spread all over the world. But the facilities were limited. To control the entire system, the Internet was built on the central network in the early 90's. In 1993 commercial use of the internet started. It spread rapidly in a short time. The number of Internet users in the current world is upwards of 100 crores.

Practical aspects of Internet: Some of the most practical aspects used in the Internet system are:

• E-mail: Instant messaging is an electronic mail or e-mail.

• Web: The method of viewing data kept in the Internet connected computers.

• Net News: News stored in Internet data repository

• Chat: Two or more people talk or text chat online.

Usage: Public information storage for the public.

• E-Cash: Economic transactions and commercial facilities.

Internet Use:

At present, the internet has become an integral part of civil society's human life. Life without internet is dead Through this, information can be collected from anywhere in the world. Information available for study, research, literary study, book, internet, anytime available. It has brought knowledge base or libraries to the hands of people. All information needed by tourists is available through the internet. Hotel reservations, ticket cuts are all possible online. Apart from telemedicine on the Internet, expert doctors can be consulted in remote areas. All the world-renowned movies-dramas are seen in the house that make the entertainment easier. Friendship and communication increased through the use of social networking sites such as Facebook, Twitter etc. through the internet. Internet brings new horizons for expansion of business Online banking, mobile banking, online trading has given new dimensions. It's time and cost saving. The internet has made the newspaper and sports fields much easier.

The harmful aspects of the Internet: There are many negative advantages of the Internet as well as its negative aspects. Of course, it depends on its use. Now with the help of false news, obscene and vicious images and videos, threatening people is increasing. These issues are destroying the youth, causing degradation of moral values. Some people are spreading viruses for bad purposes, which are making or harming countless computers. Hackers steal information through internet and harm people in different ways. It is also happening in the possession of another's account by taking possession of wealth. Many people are being damaged even after losing excess time on Facebook. But these are not the intentions of the user, but the user. The criminals are taking this opportunity.

Bangladesh and Internet: In the year 1993, the Internet was launched in Bangladesh. However, its use was very limited and it was limited to e-mail only. Internet connection continued to grow in 1996. At the beginning of 2000 the Internet subscriber was about 60,000. In 2004 the Bangladesh Information Technology Highway was added to the submarine cable.