How is working at an on-line retailer different than at a brick and mortar retailer?

How is working at an on-line retailer different than at a brick and mortar retailer? What types of jobs are necessary at each? What skills are important? What impact has technology had on brick and mortar retailers? What is your opinion related to the fate of brick and mortar stores? Is the fate the same for all?

Must be 250 words . Mist include 1 in-text citation must include 1 reference.