DNS hosting is a network service that provides domain name system resolution services. It is a service that runs Domain Name System (DNS) servers, which provide authoritative nameservers for a domains queries. DNS hosting is different from web hosting, which provides online space for hosting a website. Without DNS hosting, a domain name cannot be found on the internet.

DNS hosting can be provided by domain name registrars, third-party DNS hosting services, or by self-hosting on generic internet hosting services. Free DNS hosting services also exist, but they may offer limited functionality and features. Premium DNS hosting providers offer a plethora of customization options and usually have stronger infrastructures, faster performance, and higher uptime.

DNS hosting is optimal when the provider has multiple servers in various geographic locations that provide resilience and minimize latency for clients around the world. By operating DNS nodes closer to end-users, DNS queries travel a much shorter distance, resulting in faster web address resolution speed.

In summary, DNS hosting is a network service that provides domain name system resolution services. It is a crucial service that provides authoritative nameservers for a domains queries, and without it, a domain name cannot be found on the internet. DNS hosting can be provided by domain name registrars, third-party DNS hosting services, or by self-hosting on generic internet hosting services.