What are Subdomains? (Definition and Examples)

What are Subdomains? (Definition and Examples)
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Definitions for subdomainsub·do·main
"subdomain." Definitions.net. STANDS4 LLC, 2019. Web. 27 Apr. 2019. <https://www.definitions.net/definition/subdomain>.
subdomain
(sub´´dō-mān´) (n.) Also called a child domain, a domain that is part of a larger domain name in DNS hierarchy. DNS hierarchy consists of the root-level domain at the top, underneath which are the top-level domains, followed by second-level domains and finally subdomains. For example, in the domain name webopedia.internet.com, "webopedia" is a subdomain of the larger second-level domain "internet.com."
Subdomain
The Domain Name System (DNS) has a tree structure or hierarchy, with each non-RR (resource record) node on the tree being a domain name. A subdomain is a domain that is part of a larger domain; the only domain that is not also a subdomain is the root domain.[1] For example, west.example.com and east.example.com/ are subdomains of the example.com domain, which in turn is a subdomain of the com top-level domain (TLD). A "subdomain" expresses relative dependence, not absolute dependence: for example, wikipedia.org comprises a subdomain of the org domain, and en.wikipedia.org comprises a subdomain of the domain wikipedia.org. In theory this subdivision can go 127 levels deep[2] (though that limit is not in any published RFC). Per RFC 1035, each DNS label can contain up to 63 characters, as long as the whole domain name does not exceed a total length of 255 characters, but in practice most domain registries limit at 253 characters.
Definition of subdomain in English:
Archaic words have a charm that never fades away, from French sounding to wondrously mysterious ones.
Subdomain
Alternatively referred to as a child domain, a subdomain is a domain name with a prefix. For example, "www.computerhope.com" is the URL for Computer Hope and "www" is the subdomain. If we wanted to have a FQDN for a sub page or another external domain such as our help section, we would create "help.computerhope.com" as a subdomain.
Subdomain
The Domain Name System (DNS) has a tree structure or hierarchy, with each node on the tree being a domain name. A subdomain is a domain that is part of a larger domain, the only domain that is not also a subdomain is the root domain.[1] For example, mail.example.com and calendar.example.com are subdomains of the example.com domain, which in turn is a subdomain of the com top-level domain (TLD). A "subdomain" expresses relative dependence, not absolute dependence: for example, wikipedia.org comprises a subdomain of the org domain, and en.wikipedia.org comprises a subdomain of the domain wikipedia.org. In theory, this subdivision can go down to 127 levels deep, and each DNS label can contain up to 63 characters, as long as the whole domain name does not exceed a total length of 255 characters. But in practice some domain registries have shorter limits than that.
SME Definition (Small to Medium Enterprise)
In manufacturing, for example, an SME is defined as having 500 employees or less, whereas in wholesale trades it is typically 100 employees or less. Ranges within sectors can vary quite a bit. For instance, in sector 21, Mining, Quarrying and Oil and Gas Extraction, a business involved in Copper Ore and Nickel Ore Mining can have up to 1,500 employees and still be considered an SME while a business involved in Silver Ore Mining can only have up to 250 employees.
subdomains
With subdomain data, you can search for subdomains; view the top subdomains based on total domain traffic for a site; view traffic, demographics and other data for the subdomain itself; and add subdomains to your media plan.
domain
2) On the Internet, a domain consists of a set of network addresses. This domain is organized in levels. The top level identifies geographic or purpose commonality (for example, the nation that the domain covers or a category such as "commercial"). The second level identifies a unique place within the top level domain and is, in fact, equivalent to a unique address on the Internet (an IP address). Lower levels of domain may also be used.
Difference between Domain , Sub-Domain & Sub-Directory
Definition: “The Domain Name System (DNS) has a tree structure or hierarchy, with each node on the tree being a domain name. A subdomain is a domain that is part of a larger domain, the only domain that isn’t also a subdomain is the root domain.[1] For example, “mail.example.com” and “calendar.example.com” are subdomains of the “example.com” domain, which in turn is a subdomain of the “com” top-level domain (TLD)”. (source: Wikipedia) Example: hhttp://blog.macsales.com/ (note that How-To-Blog.TV has no “www” meaning our blog doesn’t even have the common subdomain of www associated with it.) Page Rank: Since each subdomain is treated as a different domain, subdomains will not share page rank with the website. However you can link between the website and subdomain and leverage your page rank this way. It does take time for the “link juice” to pass. Search Engine Results: Again each subdomain is considered its own website so your search engine results could include one to two results for each subdomain right? Wrong, Google now treats subdomains the same as folders for their search results. (source: SEO Round Table
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The difference between root domain, subdomain and URL level explained
Root domains are sometimes subdivided into other smaller domains called subdomains. Common reasons for this might include different subdomains covering different languages or regions.  Examples from Majestic would be our French site at the subdomain https://fr.majesticseo.com/ or our German site at https://de.majesticseo.com/. If you’re looking for data only on a specific subset of the root domain, you may be best served doing your analysis on the subdomain level. These subdomains are smaller parts of the root domain so you’ll see fewer backlinks and referring domains on the subdomain level.
Definition:Subdomain
Some sources prefer to call this an integral subdomain for clarity of exposition. $mathsf{Pr} infty mathsf{fWiki}$ adopts this convention as appropriate.
Subdomain vs Domain
Why is www special? It has to do with a lot of boring history, but suffice to say that used to be how we knew it was a webpage! Now we use http:// to say ‘This will be a webpage’ so many of us (myself included) feel that www is unnecessary and just makes URLs longer. However because of history, http://www.elftest.net and http://elftest.net will forever point you to the same place. This actually means that www is a subdomain, but it’s a very special one that points to the same place as no www at all. In very rare cases, a fancy website will redirect www and non-www to different places, but this is the exception, not the rule. Good SEO practices are to have the www and non-www point to the exact same place.
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Encyclopedia
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Domain
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Diversification
The big catch with diversification is that to do it well, the securities in the portfolio need to not “move together.” That is, the less correlated they are, the better. For example, if you invested everything in six different bank stocks, it’s fair to assume that what affects one bank stock probably affects the other bank stocks in your portfolio to some degree. Even though you’ve spread your money over several securities, you still suffer when one of your bank stocks has bad news. If you instead purchased a bank stock, a grocery stock, and a healthcare stock, you’d be investing in stocks that are less correlated with each other--that is, what affects one doesn’t necessarily affect the other. This diversification is great, but because they’re all stocks, any news that affects the stock market as a whole (say, an announcement about jobs) affects all of your stocks to some degree, no matter what industry they’re from.