Alias – SEO WIKI
Alias (Eng. Alias - a pseudonym, synonym) is a synonym for a domain that is used to assign a site several domain names.
For example, site.ru is the main domain, and www.site.ru will be its alias.
All changes that occur on the main domain are mirrored on aliases.
Aliases can be used not only to assign additional domain names to the main site, but also to register the site in several domain zones. This is usually done by large companies whose sites are known and popular. This is to prevent fraudsters from using the company name to deceive users.
Alias creation services are usually provided by hosting providers.