Briefly describe the characteristics of computer viruses and ways to prevent them.

Hello for the computer virus is not a sentence can be finished, the important thing about the virus is the time when you are in the next something, the software has some virus files, after the computer is infected with the virus, for example, the speed of booting is significantly slower than the previous one, and the reason why you can't turn on the boot is related to the virus, if you want your computer not to plant a virus, first clean up the junk files in your computer, and then in the latest version of [antivirus software] such as 360 antivirus software 360 Security Guard to achieve a two-pronged effect [360 Security Guard] is mainly used for the computer's junk file cleaning and some file updates, 360 antivirus software is the tool used to kill Trojans.

The operating system of a computer is vulnerable, and viruses are artificially created (malicious programs) that want to invade and attack the operating system of a computer through these vulnerabilities in the operating system.

Most viruses are that you go to prescribe something unsafe**, or something unsafe. Viruses exploit vulnerabilities to enter your computer and generate programs on your computer to damage your computer, control your computer or intercept some of your data. (Profit driven).

You can install anti-virus software to reduce the chance of poisoning, for example, often use 360 security guard to make up for the system, and install 360 anti-virus software to eliminate antivirus.

Reduce the chance of poisoning and anti-virus protection!

Computer viruses are transmissible, hidden, infectious, latent, excitable, expressive, or destructive. The life cycle of a computer virus: development stage, infectious period, incubation period, attack period, discovery period, digestion period, extinction stage.

Computer viruses can be divided into three types: bootstrap viruses, file viruses and mixed viruses according to the existence of **; According to the link method, it can be divided into three types: source code virus, embedded virus and operating system virus. According to the system classification of computer virus attack, it is divided into viruses attacking DOS system, attacking Windows system viruses, and attacking UNIX system. Today's computer viruses are constantly evolving, including some unique new viruses that cannot be classified according to conventional types, such as Internet viruses (spread through the network, some data carrying viruses more and more), email viruses, etc.

Computer viruses are infectious, hidden, infectious, latent, excitable, expressive, or destructive.

The life cycle of a computer virus: development stage, infectious period, incubation period, attack period, discovery period, digestion period, extinction stage.

A computer virus is a program that is artificially created, destructive, contagious, and latent in that can destruct computer information or systems. It does not stand on its own, but is hidden within other executable programs. After the virus in the computer, it will affect the running speed of the machine, and the system will be damaged at worst. Therefore, viruses bring a lot of losses to users, and usually, we call such destructive programs computer viruses.

Pro, a computer virus is a malicious program that can replicate and spread itself, automatically spreading from one computer to another, and to a certain extent, it can damage the user's files and systems, as well as hijack the user's operation. Computer viruses have the following characteristics:1

Self-replication: Computer viruses are self-replicating, i.e., they can generate and spread on their own without human intervention. 2.Auto-propagation:

Computer viruses are capable of "skipping" the spread, that is, the spread from one computer to another; 3.Hijacking user operations: Computer viruses can hijack user operations and perform unknown operations without the user's authorization; 4.

Damage to the file system: Computer viruses can also damage the user's files, or write malicious ** combined with the user's file system, thus affecting the user's operation; 5.Latent:

The Orange Frontier computer virus is latent in nature, i.e., when the user is not aware of its presence, it is still able to run in the background to achieve its malicious purpose.

1. Latentity.

In general, after a computer virus infects a system, it does not attack the computer immediately, but has an incubation period for a period of time. The length of the incubation period is generally determined by the trigger conditions set by the virus programmer.

2. Infectious.

After the computer virus invades the system, under certain conditions, it destroys the defense function of the system itself, quickly replicates itself, spreads from the infected storage location to the uninfected storage location, and can carry out virus infection between computers through the network.

3. Destructive.

Once a computer system is infected with a virus program, the stability of the system will be affected to varying degrees. In general, computer viruses attack due to their continuous self-replication.

Most of the system resources are occupied, which slows down the computer and makes it impossible for the user to use it normally. In severe cases, the entire system can be paralyzed and cannot be repaired, resulting in losses.

4. Concealment.

Computer viruses usually exist in the form of programs that people are familiar with. Some virus names tend to be named similar to system file names, such as the fake IE icon Internnet Explorer, where one "n" of the Internet word is changed to two "n" by the fake icon

It is difficult for users to spot, and once you click on the ** pointed to by these icons, you are likely to face a phishing or trojan threat; Another example is the folder EXE virus, its icon is the same as the default folder icon of Windows XP, which is very confusing, and the virus will be activated when the user double-clicks to open this folder.