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Hello,

Could anyone help me to understand why some websites are being redirected from http://www.example.com/ to http://www2.example.com/ (from www to www2)

I just wanted to know, what's the purpose of using it?

The purpose of redirecting to www2,www3..etc is mainly for Load Balancing web server farms.

These are subdomains that used to share the website's load across different datacentre/region/server-farm under a Load Balancer. An initial request to the 'www.' server may get redirected to a less-busy server, such as 'www2.' In some cases, the specific hostname may be obscured, creating the appearance that the user is viewing the "www" subdomain, even if they are actually viewing a mirror site. Although, these domains might be treated as different domain names by search engines.