Every website has its heart and soul situated in a data center. These data centers are massive arrays of computers housed in a physical location somewhere in the planet. Data centers usually contain very powerful computers that are capable of handling an enormous amount of data traffic at any point in time.
Furthermore, website owners usually subscribe to a data center's storage services based on how much information the former expects to flow in and out of the servers at any given time. For example, there are data centers in the US which offer a data hosting service for about USD 30 per month, which allows a server owner up to 2 Terabytes of traffic per month. As soon as this limit is reached, the line is cut and the website goes down.
Even if these data centers are composed of very powerful computers, these computers are usually not powerful enough to handle an event where millions upon millions of requests are sent to it in a very short span of time. When this happens, a website may go down in a span of minutes from the initial attack. For example, if I had a computer that is powerful enough, I can create a program that will send automatic queries en masse to a particular website, letting it reach its data cap very quickly, thus shutting it down. This is called denial of service.
But what does it mean for it to be "distributed?"
Of course, computers are expensive. Furthermore, there isn't really any computer that can be bought from an electronics store that can possibly and feasible do what I have mentioned. Instead, some people wrote programs that automatically take over other computers to do it too. Thus, if a person can infect a million computers all at once, bringing down a website will be very easy.
Thus, it is important to always update your antivirus and anti-spyware/malware programs. This is not only an exercise of due diligence, but it also allows you to use your system resources to the fullest, and avoid them being used by other people with malicious intent.
Computer Forensics - Distributed Denial of Service (DDoS) Attacks Explained in Simple Terms Check For The New Release in Health, Fitness & Dieting Category of Books NOW!
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