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urldnswebserversubdomainload-balancing

what is difference between www vs www1, www2, www3 etc

Does it mean that user requests directing to the different servers?

I usually see it on websites with high traffic.

for eg:- https://www.tcs.com/

      https://www2.deloitte.com/
Solution

  • This is largely speculative, but generally each of the www'n's is simply a different web server, which a given user has been routed to either manually (for example all images might live on www2, etc.) or by some form of up-stream round robin system or load-balancer, both of which tend to use some component of the end user's IP address or similar to ensure that a user's session will remain on a given server.

    Incidentally, more modern implementations will hide the existence of multiple servers behind a single 'www', so that this is less visible/intrusive.