Computer Viruses, Trojans, & Worms:-
Computer virus is a program that is man made, this programm is always hidden in your files and folders, the computer viruses destroy your data, slow down your computers, and change the default settings of your computers, it creat copies automatically and thus the viruses spread from computer to computer through memory cards, and USBs etc when you transfer data in these media. There are 2 types of viruses macro viruses and worms viruses.
Macro:-
Macro viruses are small programs that are oftenly attached with a file, suppose if you create a file in MS word, that macro virus will be attached with that file and when you copy or move the file the file will be copy attached with it, and thus it will spreed like this, this type of codes effects the program in which the file is created, if you creat a file in MS word, then this virus will effect MS word, its effect depends on what type of codes it has. Macro viruses always attached with files that are created in MS Office like programs and not with executiable files. Macro viruses spreed very fastly because due to the removeable media files are copied and movied easly.
Boot sector viruses:-
Boot sector viruses is the dangours virus which resids in the Master Boot Record or Dos Boot Sector, as you know the MBR control the sequence when the computers start, it tells the computer that in which partition the operating system reside. Thus if a Boot Sector Visrus infect your MBR or Dos Boot Sector it will run automatically when ever you start your computer and when it infect your memory the antiviruses hardly detect it. And from there this virus spreed in every drive you can read, if you want to remove viruses like this then you must use the antiviruses bootable disk to start computer from these disk and then run antivirus to detect it.
Worms:-
The worms are small coding programs, they are too consideres as viruses because they they few similarities with viruses, they irrupt computer functions or a computer programs, but the mail diferrence is that they do not attached himself with files but they reside in computer seperately and from their they effect the computers.
