It has already been stated that commerce consists of trade and auxiliaries to trade. These services are essential and indispensable for the smooth flow of trade and industry. The examples of business services are Banking, Insurance, transport, warehousing Advertisement and communication. This chapter is incorporated with different concepts, such as – Meaning of service sector, nature of services, types of services – business services, social services and personal services, categories of business services, banking – Commercial banks, co-operative banks, specialised banks and central banks, functions of commercial banks, e-banking, Insurance, its functions and principles, types of Insurance, postal services etc.