Alhaj Md. Abu Yusuf: The relationship of the virtual world with the real world is now so close that one has become complementary to the other.

Life without a virtual or cyber world in an urban environment is now unimaginable. But naturally, the virtual world is not as smooth as the real world. It is important to ensure security in this world as well. Virtual or cyber security means ensuring the security of everything related to this world. However, the virtual world is like an ocean where there is a risk of great danger along with invaluable resources. It is not the case that those who enter this ocean will be attacked again. However, this fear remains for everyone.

We have said before that a computer virus is a major threat in the virtual world. Virus is an acronym for Vital Information Resources Under Seizure in computer terms. This literally means that important sources have been confiscated. Renowned researcher Fred Cohen has named a computer virus. A virus is not something that lives on a computer, but it is a program that behaves like a virus that lives on a computer. In medicine, just as a virus can kill a person, a computer system can become useless due to the virus. A computer virus is a man-made program.

There are different types of viruses. Each virus has a different attack strategy. A few signs need to be closely observed to understand if the computer system is infected with a virus. These are- slowing down the computer or taking abnormal time to load or run a program; Automatically change the name of the storage disk volume; Bad sectors appear on harddisks; Dot exe (.exe) file resizing; unexpected changes to system time and date may occur; Files can be deleted from memory without any reason.

Also the system`s settings may change automatically; Display resolution cum setting may change; Folder options can be hidden; Free memory space may show less in quantity; Hard disk partitions are corrupted and data can be lost; Can deactivate the computer by deleting the data in the computer`s BIOS; Can suddenly give various unexpected error messages; It may take some time to install the necessary software or it may send the message that it will not be installed; The computer may hang or restart at any time `; As a result, any unsaved document may be lost.

Different types of abnormal behavior can also be noticed. If one or more of these symptoms appear, then the computer can be assumed to be infected with a virus. There are ways to deal with computer viruses. Because work is constantly being done to prevent and destroy the virus. Various individuals and organizations are working towards this goal. They are creating one anti-virus after another. It is important to install anti-virus to protect your computer system. This type of anti-virus protects the computer from harmful viruses. In addition, the anti-virus program needs to be updated regularly. You need to take a good look before installing any software. The publisher has to take a good look at it. If it is bad or not trusted, you should refrain from installing. The computer firewall must be kept on. Refrain from turning on any spam emails. Spam emails may not contain any files or requests to download or provide names and addresses.

In fact, anyone can use a computer and enter the Internet or virtual world. But to stay safe in this world, some general knowledge and training is essential for every internet user. How to use technology, how to use it to stay safe, how to encourage others to stay safe - everyone needs to know the strategy. In countries like Bangladesh and India, a large portion of those who use the Internet still do not know much about technology. As a result, individuals have problems when using technology at different times. Many times they have to face punishment for creating big problems. In this situation, overall caution and proper knowledge is essential.