There are different levels of domains.
Examples of the various levels are as follows:
Top-level (TLD) - .com, .net, .org, .edu, .gov
example: www.example.com
2nd-level - sitename, business, search, etc.
(2nd-level may contain letters, numbers, hyphens)
example: www.example.com
3rd-level - www, www2, keyword (optional)
(note: make your site works with or without www)
example: www.example.com
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