A touchscreen is a display that accepts input directly from a finger or stylus. In security terms, it is both a screen and an input device, which means it can collect sensitive actions such as PIN entry, approval taps, and password typing. Touchscreens are common on phones, payment terminals, kiosks, and industrial panels, so they are often part of the trusted path into a system.
That makes them a target in real attacks and a concern in defense. Attackers may watch finger movements, hide malicious overlays, or trick users into tapping the wrong control. On shared or public devices, smudges and screen size can also reveal patterns. Defenders use screen-locks, biometrics, randomized keypads, anti-tamper hardware, and secure touch handling to reduce risk. A touchscreen is convenient, but security depends on how well the device validates each touch and protects the data behind it.