Well , Anti virus is the software which helps our system to run smooth . it protects our system from viruses which creat problems in our system . viruses are hang up our system and defalt our data and creat problem to running smooth our system .
but in market there are lots of anti virus system are present there but only few of them are work properly , lots of them are totally waste . few anti virus software are show that they cleaned the system from virus but after few minutes there are another notification for virus clean.