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Definition
Device fingerprinting is a method of recognizing a device based on technical signals it sends during an online session. These signals can include browser type, operating system, screen size, IP address, installed fonts, device settings, and other attributes.

Why it matters
Device fingerprinting matters because it helps systems detect suspicious access attempts without relying only on passwords. It can support fraud prevention, risk scoring, and account protection by showing whether a login comes from a trusted or unfamiliar device.

Example use case
A user logs in from their usual phone, and the system recognizes the device fingerprint. Later, the same account is accessed from a different device with unusual settings, so the system flags the login for extra verification.