When setting up a website, it's also conventional to also set up a
www stands for
world wide web.
Subdomains are part of a main (or root) domain. For example,
www.yourcustomdomain.com is a subdomain of the
yourcustomdomain.com root domain.
We can set up a subdomain using a
CNAME record, which stands for
CNAME record specifies that a domain name will be used as an alias, or substitute, for the true (canonical) domain name.