U heard about www, http and https, then have u heard about www2/www3 ? and why it is used? for ex: what is difference between www.example.com and www2.example.com ?
In the DNS hierarchy www3 or www2 is simply a subdomain. www1/www2/www3 are just mirror of server..
Many business (eg HP), banking and many complex web sites uses this type of domain just to separate the data and services form their main site..This is just to handle their traffic.
According to wiki : Some websites use different subdomains to point to different server clusters. For example, www.example.com points to Server Cluster 1 or Datacentre 1, and www2.example.com points to Server Cluster 2 or Datacentre 2, etc.
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