Why would a shoe shop use a database for?

A database is used in stock control - often triggering a reorder automatically when stock in a particular line reaches a certain low level. Within modern cash systems (EPOS) database are used not just for inventory, replenishment but also for sales data tracking, financial data tracking and also they communicate across epos systems to back office units to maintain storge of such data as barcodes, item specific code, legislative tax data references and now can be used to capture and reatain customer data i.e.loyalty cards and accounts