An exploit kit is a type of malicious software package used by cybercriminals to automate the process of finding and exploiting security vulnerabilities in a user's device or software. When a user visits a compromised website, the exploit kit scans their system for known weaknesses. If a vulnerability is detected, the kit can automatically deliver and execute malware without the user's knowledge, often leading to data theft, ransomware, or other cyberattacks. Exploit kits are a common tool in cybercrime, enabling attackers to target large numbers of victims efficiently and with minimal effort.