What is DNSSEC and Why Is It Important?

**Executive summary:** This document provides an overview of DNSSEC as a mitigation for inherent DNS security weaknesses, describing how cryptographic signatures (RRSIG), DNSKEY records, ZSK/KSK key roles, and DS records establish a chain of trust from the root to a domain to prevent cache poisoning and spoofing; it also summarizes steps to enable DNSSEC, validation behavior, and operational considerations such as key management, registrar DS submission, compatibility issues, and monitoring.