A compromised device is any computer, smartphone, or networked equipment that has been infiltrated, controlled, or altered by unauthorized individuals, typically cybercriminals. This compromise can occur through malware, phishing, unauthorized access, or software vulnerabilities. Once compromised, the device may be used to steal sensitive data, launch attacks on other systems, or perform malicious activities without the owner's knowledge. Detecting and securing compromised devices is crucial to prevent data breaches, financial loss, and further spread of cyber threats. Regular software updates, strong passwords, and vigilant monitoring can help protect devices from being compromised.