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Virus
Just as you and I get sick, a computer can too; it is not something you want to happen! A computer virus essentially is a small program, script or application that can affect a single workstation or travel across a network. Often a virus will attach themselves to programs such as e-mail applications which can spread the virus faster. Viruses are designed to do damage to your computer operating system (e.g.) Windows 7 or MBR (Master Boot Record.) These small programs are capable of moving files, erasing files, eating up your computer’s memory thus making it very slow, and in some cases, causing the entire computer to crash and no longer boot (e.g.) (black screen and blinking cursor.) It is recommended to use both an anti-virus application as well as a malware application to prevent infection.
Malware
Short for malicious software, malware signifies software applications, which are designed to cause severe damage to your computer (e.g.) (A pop up application informing you your computer hard drive is damaged, then asking you to buy the program to fix it.) Malware is very similar to a virus. Basically a virus will delete files, move files, and corrupt your operating system. Spyware on the other hand will look to collect information about the user’s system such a credit card into or web pages you visit without you even realizing it .
Router
A router is a hardware device that directs traffic or data from the (LAN) Local Area Network to another network connection. The best way to think of a router is like a toll booth. When you go through a toll booth, you need to pay money to connect to the other side to reach your destination. Basically no money equals unauthorized access to connect or pass through. The same with a router, if you are not authorized, meaning the router does not recognize your network you are unable to pass. So how is access achieved? The shortest and simplest way of explaining how is to think of sending a letter to your friend. You have your name and address on the letter so they can get back to you. If your friend writes back and you get the letter then communication has been established. Your computer does this by your exchanging IP address packet information back and forth with the router. If the two devices agree with each other then you paid the toll..
Hard Drive Sector
A sector is the smallest unit that can be accessed on a hard disk. Each platter of a hard disk is separated into multiple tracks, which circle around the disk. These tracks get longer as they move from the middle towards the outside of the disk, so there are more sectors along the tracks near the outside of the disk than the ones towards the center of disk. This variance in sectors per track is referred to as "zoned-bit recording. The larger the files, the more sectors which are taken up; this means less hard drive space.
DHCP
Stands for "Dynamic Host Configuration Protocol." A network server uses this protocol to dynamically assign IP addresses to networked computers. The DHCP server, for example your router waits for a computer to connect to it, then assigns it an IP address from a master list stored on the server. DHCP helps in setting up large networks, since IP addresses don't have to be manually assigned to each computer on the network..
Defrag
Defragmenting your hard disk is a great way to boost the performance of your computer. Though the term "defragment" sounds a little abrasive, it is actually a simple and helpful process. After all, a defragmented hard disk is a happy hard disk.

Adding and deleting files from your hard disk is a common task. Unfortunately, this process is not always done very efficiently. For example, when you delete a bunch of little files and add a new large file, the file may get broken up into mulitple sections on the hard disk. The computer will still read the newly added file as a single valid file, but the drive will have to scan multiple parts of the disk to read it. Because hard disk seek time is one of the most significant bottlenecks in a computer's performance, this can drag down your computer's speed quite a bit..

                                                                      
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