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Domain names are the unique, human-readable Internet addresses. They are made up of three parts: a top-level domain (sometimes called an extension or domain suffix), a domain name (or IP address), and an optional subdomain.
A "root domain" is a combination of the domain name and the top-level domain. The "http:// or https://" is part of the URL but not the domain name of a website and is known as the "protocol." The "https://" component is a secure protocol that is now widely used to guarantee the security of online traffic.
Let's take a closer look at each of these elements:
The official word for the suffix that appears at the end of a domain name is top-level domain (TLD). Top-level domains include the following
.com
.net
.org
.uk
While we're all certainly acquainted with the TLDs listed above, webmasters may pick from over 1,000 other TLDs. This comprises TLDs such as .support, .clothing, .shop, and .insurance, among others, as well as TLDs connected with certain nations or territories such as.uk (United Kingdom) or.fr (France). Nation code top-level domains, or ccTLDs, are TLDs that are particular to a country (or occasionally a region).
The second level of a domain's hierarchy is made up of its domain names (after the top-level domain). Domain names on a certain top-level domain, sometimes referred to as a root domain, may be acquired from registrars. These domain names indicate the precise, one-of-a-kind location of a website.
If you are thinking about optimising your root domain for search engines, you should proceed with caution because search engines do use the keywords in domain names as a ranking factor (which is why there are domains like "where-to-buy-the-best-donuts-in-Seattle.com"), but it is important to keep the following in mind: Google's search algorithm was designed with a number of specialised goals, one of which is to counteract keyword-stuffed exact-match sites.
While the phrase "root domain" was established in the context of DNS (domain-name servers), it is now often used to describe the combination of a unique domain name and a top-level domain (extensions) to produce a full "website address." The root domain of your website is the most important page in the site structure (probably your homepage). Individual pages or subdomains may be created from the root domain, but each page URL must technically have the same root domain in order to be included in your website.
A single website's pages all share the same root domain (explained below), and no two websites may have the same root domain.
Because root domains reflect whole websites rather than individual web pages, counting linking root domains rather than linking URLs (pages) may be a more accurate means of determining the extent of your site's inbound link profile (generally speaking, more linking root domains is better). You can observe what type of influence the number of connecting root domains and other critical link metrics have on a site's rankings and popularity by analysing the top 500 sites on the web, for example. Backlink analysis tools, such as Link Explorer, may assist you in determining the total number and exact identity of root sites connecting to your site.
Subdomains are the third level of a domain's hierarchy and are subdomains of a bigger top-level domain. They are appended before the root domain and separated from the domain name by a period.
For example, "blog.example.com" and "shop.example.com" are both subdomains of the base domain "example.com." Subdomains may be created under any root domain that a webmaster owns.
The two most popular subdomain options are:
https://www.example.com ("www" is the subdomain) ("www" is the subdomain)
https://example.com (has no subdomain) (has no subdomain)