Computer and virus protection is referred to as the complementary goods.
Step-by-step explanation:
Complementary goods are referred to as that good where use of one good is linked with the use of other goods. Suppose in this case when a consumer buys a computer he or she also buys a virus protection, they act as a complementary goods. When the price of the computer falls there will be increase in the demand of virus protection as a result there will be a rightward movement or shift of the demand curve.
On the other hand when the price of the computer increases there will be fall in the demand of virus protection because due to rise in price there will be fall in demand that is people will buy less and the demand curve will shift leftward.