A subdomain is a part of a larger domain that can be used to create a separate, distinct website or web application within the larger domain.
Subdomains are created by adding a prefix to the main domain name and are typically separated by a period (.). For example, if the main domain name is "example.com," you can create a subdomain by adding a prefix, such as "blog," to the main domain name, resulting in the subdomain name "blog.example.com." You can then use the subdomain to host and access a separate website or web application related to the main domain with unique content and features.
Subdomains are used to organize and structure the content and features of a website. They can also be used to create separate environments for different purposes, such as testing, development, or staging. Subdomains are also helpful for creating distinct, branded experiences for different audiences or segments- for example, by addressing users in their own language.