Great Article! POS systems have become one of the most complex software systems today because of the varied features required by different businesses or end-users. POS systems initially served the retail, wholesale, and hospitality industries hence billing PoS software suites included functionalities aside from managing sales transactions such as inventory, stock counting, vendor ordering, customer loyalty, reporting modules, purchase orders, stock transferring, quotation issuing, barcode creating, bookkeeping and accounting. And for practical purposes and to maximize the system’s usability, each of these modules is interlinked.