DNS

Domain Name System — a hierarchical distributed name resolution system that translates domain names (e.g. seoaraci.com) into IP addresses that people can easily remember. There are different record types such as A, AAAA, CNAME, MX, TXT, NS, SOA. It affects DNS response time, TTFB, and page speed. Using DNS-over-HTTPS with Cloudflare or Google DoH increases security.