When we talk about a computer virus, it usually means any type of code designed to infect computers and spread to more computers. They are created by malicious programmers who want to make money by attacking your computer on other targets or stealing your personal information. They may also be trying to see how far their virus is spreading. Different viruses affect Windows, Mac, and Linux computers, and even run data servers and the Internet, which keep companies. Antivirus programs can help, but they also have trouble dealing with threats they have never seen before. Over the years, thousands and thousands of viruses have spread online and they have caused billions of dollars in lost productivity, wasted resources and broken machines. A few dozen of those viruses stand out some spreading particularly quickly or infecting many or causing tons of damage. Some have done all of the above. Because most viruses are so bad, it is difficult to choose the ones that are, in many ways, object