Question: Scholars hold different opinions concerning Bid‘ah (innovation in religion); some of them say that there is a good Bid‘ah and a bad one. Is this true?
Answer: Bid‘ah, it can be defined as all things invented or acts done for which there is no precedent. It can be either related to the dealings and affairs of worldly life, such as inventing planes, cars, trains, electrical devices, cooking utensils, air conditioners used for warming and cooling, and even war machines such as bombs, submarines, tanks, and other objects made to serve people in this world. Such things in themselves are permissible and there is no sin in inventing them… read more here.