Mobile POS, or mobile point of sale, is a portable payment tool that lets a merchant accept card payments away from a fixed checkout. It may be a small card reader attached to a phone or tablet, or a handheld terminal with its own network connection. The device still performs the core POS functions: capturing card data, authorizing the payment, and recording the sale.
In cyber security, Mobile POS matters because it concentrates payment trust in a device that moves between locations and users. That creates risks from theft, tampering, weak authentication, unpatched software, and insecure Bluetooth, Wi-Fi, or app integrations. Attackers may try to alter transaction amounts, skim payment data, or redirect payments through fake interfaces. Defenses include device hardening, trusted payment apps, encryption, PIN or biometrics for operator access, regular updates, and careful verification of each transaction before approval.