What is a Subdomain?
A subdomain is a domain that is part of a main domain. It is created to organize and navigate to different sections of a website.
Examples
| Main Domain | SubDomain |
| s4e.io | app.s4e.io |
| google.com | mail.google.com |
| box.com | blog.box.com |
| yahoo.com | news.yahoo.com |