DNS security is about providing security against DNS exploits like DNS hijacking, DNS Spoofing and Denial of Service attacks. The DNSSEC protocol helps in mitigating such security issues by digitally signing data so as to ensure its validity. DNS system has many design limitations, which help hackers hijack DNS lookups for all kinds of malicious purposes. For example, they could divert users to fraudulent websites and gather sensitive personal data or distribute malware through these websites. It can shut down denial-of-service attacks by limiting services by limiting the rate of attacks.”]
Source: https://hackercombat.com/what-is-dns-security-why-is-it-important/