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https://www.youtube.com/watch?v=yv45-z50pG4
Nameservers are the database servers that store and provide your DNS information for Internet clients. You Domain Registrar sends your DNS configurations to the nameservers.
Generally you use the nameservers provided by your ISP, but may change them if you are required to by a cloud platform, or if you have the need to manage your own nameservers.