Traditionally, point of sale is a computer used to process sales transactions in a retail establishment. A POS has some features of a traditional cash register but can process cash, check, mobile wallet and credit and debit card transactions.
A POS can be configured to communicate with other devices in a retail establishment, such as a desktop computer and handheld inventory control devices, known as input/output devices. In the digital age, a smart device can be converted into a POS with a credit card reader attached to it. Cloud-based bookkeeping software also has POS capability, allowing brick-and-mortar and online retailers to complete transactions and maintain inventory with personal computers.