The meaning of the term “Root Domain” is different depending on whether you refer to the internet in general or your website. In technical terms, a root domain refers to the highest hierarchical level of the internet. It is higher than top-level domains like .net and .com. Away from the context of Domain Name System (DNS), your root domain usually means the highest hierarchical level for a website you control.
If you register a domain name or website name, you register a root domain. Hence, you can create file structures and subdomains branching out from the registered root domain. Your website’s structure affects your web content’s performance and ranking in search results. When Google equates a particular subdomain with quality, it influences how web pages within the subdomain rank in search results.
In marketing, tracking the number of high-quality links pointing to your website is useful. With that, you can know how well your content is performing in search results.