DNS Security Extensions (DNSSEC) are a set of Internet Engineering Task Force (IETF) standards created to address vulnerabilities
in the Domain Name System (DNS) and protect it from online threats.
The purpose of DNSSEC is to increase the security of the Internet as a whole by addressing DNS security weaknesses.
Essentially, DNSSEC adds authentication to DNS to make the system more secure.
The Domain Name System manages Internet navigation by locating domain names and mapping them to IP addresses.
DNS, as originally designed, has no means of determining whether domain name data comes from the authorized domain owner or has been forged.
This security weakness leaves the system vulnerable to a number of attacks, such as DNS cache poisoning, for example.