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A subdomain is a domain that is attached to a root domain (or main domain) that can direct browser requests to specific files on a specific server.
You are currently looking at files on LarryLudwig.com – but more specifically, you are looking at files on the LarryLudwig.com root domain (note no www. in my URL). Though I do use a subdomain for my membership area members.LarryLudwig.com.
As an analogy, if a domain is like a physical address, but on the Internet, then a subdomain is like a Suite or an Apartment number. Like a Suite number, they only make sense as part of the larger address, but they allow visitors to access a more specific (and usually different) location.
That’s the short version, but there’s more to subdomains than just the definition and an analogy.
What Is A Subdomain?
A subdomain is the left-most part of a URL and is before the domain name. The subdomain and domain name are separated by a period.
Like I wrote in What Is A Domain Name, the Internet is nothing but a bunch of connected devices with IP Addresses (usually a series of numbers like 192.168.0.1). IP Addresses are not only hard to remember, but they change frequently.
A domain name is a great way to provide a memorable way to locate your information on the Internet. It’s easier to say that your website is at LarryLudwig.com than remembering the IP address 70.39.148.106.
But what if you have several different Internet applications that you want to all live on your domain name? That’s where subdomains come in.
Subdomains always come before the root domain and before the top-level domain (TLD). For this website, LarryLudwig.com:
LarryLudwig is the root domaincom is the top level domain
A subdomain is a part of the root domain. You can “point” different subdomains via the Domain Name System (DNS) to completely different server locations.
You can have an infinite number of subdomains and even sub-subdomains with any domain name you own.
A website can also have no subdomain like this very…
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