Question

importance of subdomain

Please not from internet​

Answer 1

A subdomain lets you separate portions of your site that are extensive enough to warrant their own dedicated hierarchy without going through all of the trouble of setting up a new site with a new domain or confusing visitors with a completely different root domain.

Subdomain enumeration is the process of finding valid (resolvable) subdomains for one or more domain(s). Unless the DNS server exposes a full DNS zone (via AFXR), it is really hard to obtain a list of existing subdomains. The common practice is to use a dictionary of common names, trying to resolve them.

Explanation:

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