How was viruses created?Are they different to the viruses which infects your computer when you open a certain site? If not why are they called viruses,the things that infect computers?

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Biological viruses contain DNA or RNA and protein.  The first two molecules contain information like computer programs do.  Proteins are tools that can build new structures.  Biological virus proteins are used to get them docked to target cells and then inside.  Sometimes they also are used to takeover the cell's DNA processes.  Biological viruses require the resources of a cell to make copies of themselves.  When they replicate they clog up the normal operation of the cell, produce toxic waste and end up destroying the cell.  If they go into hiding in the cell's DNA they may sit quietly waiting for the right time to activate and replicate.  Computer viruses can be designed to wait too for a date, time......  They can hog the computer's resources and shut down the whole operating system.  The similarites between the computer virus and the biological viruses were so strong, the computer damaging programs were called viruses.