What is the risk of giving cvv no on line paysites?

jraju (Others) (277 Points)

14 November 2016  

Hi, Some sites require you to furnish the cvv number of debit cards for even a small online transaction involving money. But I heard tha this information is risk to give. But not furnishing does not complete your transaction. I want to know the risk involved in giving this number on online site and also how could i protect this no. Some newspaper quote that this should be masked by giving asteriks . But there is no provision of spaces in those sites.

                              Would any body clarify on this?