What is a virus ?
A virus is software code that attaches itself to a program or file to propagate from one team to another. Infects as it is transmitted. Viruses can damage software, hardware, and files. Virus code written with the intention expressed in replicated. A virus attaches itself to a host program and then, trying to spread a computer to another. It may damage hardware, software, or information. Just as human viruses have a variable gravity, from the Ebola virus to the 24-hour flu, computer viruses range from moderate discomfort to be destructive. The good news is that a real virus is not spread without human intervention. Someone must share a file or send an email to propagate it.
What is a worm ?
A worm, like a virus, is designed to copy a computer to another, but it does so automatically. Firstly, it takes control of the equipment features that allow the transfer of files or information. Once a worm is on your system, you can travel only. The great danger of worms is their ability to replicate in large numbers. For example, a worm could send copies of itself to everyone in your e-mail address book, which causes an effect dominated heavy network traffic that can make slower corporate networks and the Internet in its entirety. When new worms are released, they spread very quickly. Block networks and possibly cause long waits (for all users) to view Web pages on the Internet.
A subclass of virus worm. In general, the worms propagate without user intervention and distributes complete copies (possibly modified) of itself by the networks. A worm can consume memory or network bandwidth, which can cause a team to hang.Since the worms do not have to travel through a program or “host” file, they can also create a tunnel system and allow another user to take control of the remote computer.
How does worms and other viruses transmit ?
Virtually all viruses and many worms can not be transmitted unless you open or run an infected program. Many of the most dangerous viruses are spread primarily through email attachments, files that are sent along with an e-mail message. Normally you can know that the email includes an attachment because it shows the a clip icon that represents the attachment and includes your name. Some file types that can be received by e-mail usually are photos, letters written in Microsoft Word, and even Excel spreadsheets. A virus begins to open an infected attachment (usually is clicked the attachment icon to open it).
Never open anything that is attached to an e-mail unless you expect the file and know the exact contents of that file.
If you receive an email with an attachment from an unknown person, delete it immediately. Unfortunately, sometimes it isn’t safe to open attachments from people who know. Viruses and worms have the ability to steal information from the e-mail programs and send to all those included in the address book. Therefore, if you receive an email from someone with a message that does not understand or a file you didn’t expect, please always contact the person and confirm the contents of the attachment before you open it. Other viruses can spread through programs that are downloaded from the Internet or disc full of viruses that friends let or even that are bought in a store. Less common forms of contracting a virus. Most of the people are contagious virus if you open and unknown running e-mail attachments.
How do I know if I have a worm or virus ?
To open and run an infected program, you might not know that he has contracted a virus. Your team can be more slow or crash and restart every few minutes. Occasionally, a virus attacks the files you need to start a team. In this case, you can press the power button and be looking at a blank screen. All of these symptoms are common signs that your computer has a virus, although they may be due to problems of hardware or software that have nothing to do with a virus. Pay attention to messages indicating that you have sent e-mail with virus. It may mean that the virus has included your email address as the sender of an infected e-mail. This does not necessarily mean that you have a virus. Some viruses have the ability to forge email addresses. Unless you have installed software updated antivirus in your computer, there is a secure way of knowing if you have a virus.