Three factors bring change in the culture of a society. These are: Inventions: The process of creating new cultural elements out of the existing elements. Since the modern man has a comparatively richer reservoir of cultural elements at his disposal, therefore he creates more inventions than the man in the olden times. The modern man does not have to reinvent the wheel; he has to use this wheel, improve uponit and bring something new. Discovery: It is the process of finding that already exists. Diffusion: It means the spread of cultural traits from one society to another. It is the borrowing of culture by one group from another. For purposes of diffusion contact between the two groups or societies is necessary. In the olden times, due to the lack development of means of transportation and communication, contact between different societies was limited. Therefore the diffusion was also limited. Whatever the diffusion took place it was more a result of physical contact. But...