Dynamic DNS (Domain Name System) is a service that automatically updates the DNS records of a domain whenever its associated IP address changes. This is particularly useful for devices or servers with frequently changing IP addresses, such as those on residential internet connections. In cybersecurity, attackers can exploit Dynamic DNS to frequently change the IP addresses of their malicious servers, making it difficult for security teams to track, block, or blacklist these servers. By leveraging Dynamic DNS, cybercriminals can maintain control over their infrastructure and evade detection, complicating incident response and threat mitigation efforts.