Computer viruses are computer programmes that place their own copies in other different computer programmes or documents. They can make all the files on our computers useless or even worse they can ruin our computers too. The unlimited spread of viruses can overload our computers’ resources.
Virus infections are not activated immediately just later when a certain time has spent after the arrival of the original infection. Later it is more difficult to restore the damages caused by a virus so it is wise to filter them.