What is a DNS provider?

Question

Domain Name System

Hello, what is a DNS provider? Where is its place between a domain registrar and hosting? And how do their services work with hosting?

Answer 1

In order not to get confused, I will immediately clarify. There are free DNS servers through which you can configure a router or router instead of an Internet provider. But probably the author is interested in learning about free DNS hosting.
What are they for? Most registrars have their own free DNS servers and the DNS working zone (resource records) can be edited with them. But there are registrars who do not have their free ones. Of the well-known in Runet, these are at least two registrars: Ru Center (nic.ru), in which this service is paid, if I'm not mistaken, it costs 300 rubles per quarter or 900 rubles per year, and the cheapest ru and rf domain registrar - atex .ru, which simply does not have its own DNS servers.
In this case, if, for example, you are currently creating corporate mail, but you do not plan to buy hosting yet, you can use free DNS hosting. Of those that I can recommend:
1. Excellent reliable free DNS hosting dns.he.net
2. cishost.ru - free DNS hosting with the ability to redirect.
3. Mail Ru for business: in addition to mail for the domain, there is also free DNS hosting, and when registering, you can simultaneously delegate the DNS zone there and make free corporate mail.
That is, at the registrar you specify NS records for example dns.he.net, and already there you prescribe A records pointing to the IP addresses of your site, MX mail records and others
How it works: when some server, for example, a mail server, finds out where mail is located for your domain, it sends a request to the root directory of your zone (I'm simplified), receives a response that the working DNS zone of this domain is located on dns.he servers. net, makes a request there, receives a response that MX records are specified by Yandex mail, and sends a letter to the Yandex server.