Nameservers exist to make navigating the internet easier. They contain specific information pertaining to a domain’s DNS records, which guide requests to the relevant services, including the website itself via A and AAAA records but also Email via MX.
An A record is an IP address in IPv4 format that corresponds to your website, and AAAA records are those in IPv6 format.
Most domains have at least 2 nameservers, this provides a failsafe in case of fault or attack with the aim to prevent downtime for the corresponding services. However, a domain can have more than 2 nameservers, which may be useful for very popular high-load websites and infrastructure.
Without nameservers, the internet would be much less human-friendly, users would have to remember the IP addresses of each website they visit! Although this wouldn’t be the only issue, many of the services built would likely not work, requiring huge changes to existing software.
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Incorrectly configured domain records are one of the most common causes of websites appearing broken. Using the provided defaults helps ensure that all the supplied records are correct and tied to your hosting package.