A POS system is the heart of any modern shop — it is where a sale actually happens. But a good point-of-sale system does far more than take payment: it updates your stock, records the accounting, and tells you what is selling. This guide explains what a POS system is, how it works, what it includes, and what to look for.
What is a POS system?
POS stands for point of sale — the point where a customer pays for goods or services. A POS system is the combination of hardware and software that processes those transactions: it rings up items, takes payment, prints or emails a receipt, and records the sale. Modern POS systems go further, automatically updating inventory and accounts with every sale.
How a POS system works
A typical sale flows like this:
- The cashier scans a barcode or selects a product; the POS looks up its price.
- The system totals the basket, applies any discounts and tax.
- The customer pays — by cash, card, or mobile — and the POS records the payment.
- A receipt is printed or sent, and the sale is saved.
- Behind the scenes, stock counts drop and the sale posts to your accounts automatically.
That last step is what separates a real POS system from a simple cash register: the data updates everywhere at once.
What a POS system includes
Hardware can include a terminal or tablet, a barcode scanner, a receipt printer, a cash drawer, and a card reader. Software is where the value lives — handling sales, inventory, customers, staff, and reporting. See the full list in POS features for retail.
Types of POS systems
Traditional (legacy) POS runs on-premise on a single till and stores data locally. Cloud POS runs on internet-connected devices, syncs across locations, and keeps your data safe off-site — often with an offline mode so sales continue if the connection drops. For most businesses today, cloud wins; see cloud POS vs traditional POS.
What to look for in a POS system
- Fast, reliable checkout that works offline
- Real-time inventory that updates as you sell
- Multiple payment methods and clear receipts
- Multi-branch support if you have (or plan) more than one location
- Built-in reporting on sales, stock and profit
- Connection to your accounting so the books stay current
See the full buyer's checklist in how to choose a POS system.
A POS that connects your whole business
The biggest gains come when your POS is not an island. RushFlow's point of sale updates inventory and accounting in real time and works across every branch — so the moment you make a sale, your stock, cash position and profit are already up to date.