Computer viruses were more of an urban myth than a real threat a few decades ago, but over the years, the situation has changed drastically. These days, malicious executable software programs are great menaces to anybody and anything from governments and big international corporations to small businesses and individual computer users. Created and programmed by anybody from experienced hackers to keen amateurs and even children, computer viruses are malware programs that – when executed – replicate by inserting copies of themselves into other computer programs, data files, or the boot sector of the hard drive. Viruses often perform some type of harmful activity on infected hosts, such as stealing hard disk space or CPU time, accessing private information, corrupting data, displaying political or humorous messages on the user’s screen, spamming their contacts, logging their keystrokes, or even rendering the computer useless. Needless to say, computer viruses are major annoyances and can lead to some dire consequences. Protect and inform yourself about these malicious bugs with these 25 interesting facts about computer viruses. There’s not a person in this world who is not at risk from a computer virus attack (no matter how powerful your antivirus software maybe). Therefore, the more you know, the more you’ll be able to protect yourself.