What is a subdomain
The subdomain is a part or extension of the domain. This simply states that the domain can be divided into certain parts which can be helpful for google search engines to access the information of your site without rendering much on your website.
This subdomain feature also enable website owner to clearly format the website into different section which can provide relevant information about which client’s are looking for.
Here are the example:
You can create a subdomain by name portal.yourdomain.com. Here portal clearly defines a folder or section of website where client can views infromation about your product or the services which he is using.
You can create 100 subdomains whose character lengths can be 25 characters long.