POS - Point Of Sale

The term is often used in connection with hardware and software for checkouts, and in the case of variable locations, with wireless systems.

POS systems evolved from the mechanical cash registers of the first half of the 20th century. Examples of this type of register were the NCR registers, operated by a crank, and the lever-operated Burroughs registers. These registers recorded data on journal tapes or paper tape and required an extra step to transcribe the information into the retailer's accounting system. The next step in evolution was to move to operation by electricity. An example of this type of register was the NCR Class 5 cash register. In 1973 new registers that were driven by computers were introduced, such as the IBM 3653 Store System and the NCR 2150. Other computer-based manufacturers were, and Data checker. 1973 also brought about the introduction of the EAN barcode readers on the POS systems. In 1986, the POS systems became based on PC technology with the introduction of the IBM 4683.

During the late 1980s and throughout the 90s stand-alone credit card devices were developed so credit card processing could be more easily and securely added. Some popular models include the VeriFone Tranz 330, Hypercom T7 Plus, or Lipman Nurit 2085. These relatively simple devices have evolved in recent years to allow multiple applications (credit card, gift card, age verification, employee time clock) to reside on one device. Some wireless POS systems for restaurants not only allow for mobile payment processing, they also allow servers to process the entire food order right at tableside.

As of 2005, Dollar Store retail POS systems were among the most sophisticated and powerful computer networks in commercial use. In fact, most retail POS systems do much more than just "point of sale" tasks. Even for the smaller tier 4 & 5 retailers, there are many POS systems available that include fully integrated accounting, inventory management, open to buy forecasting, customer relation management (CRM), service management, rental, and payroll modules.

With all of these options available, one will commonly hear a variety of terms used when referring to a certain POS software application. Those terms can include: retail management software, business management software, POS system, and point of sale software.