Device fingerprinting is a technique used to identify and track individual devices, such as computers, smartphones, or tablets, across the internet. It involves collecting information about a device's unique characteristics, such as its hardware and software configuration, IP address, and browser settings, and using this information to create a "fingerprint" that can be used to identify the device. Device fingerprinting is often used for online tracking and targeted advertising purposes, as well as for security and fraud detection. Because it does not rely on cookies, device fingerprinting is a popular alternative to traditional tracking methods, and is considered to be more effective at identifying and tracking devices that have cookies disabled. However, it also raises concerns about privacy and the potential for abuse.