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“www.” is the subdomain. For an example “www.example.com” is a subdomain of “example.com” main domain. What actually does usually is either of the domains are selected as main domain (canonical form) and make others to redirect to the main domain for convenience of the user. Conventionally, the “www” subdomain, contains the main website. This has a historical background which we will be discussing in the first part of the article.
Have you ever wondered how your messages are delivered to a specific person you want to reach? Let me explain with some technical detail and a simple example. Imagine Anne wants to meet with Marie, so she writes a message to Marie that says, ‘Hello, let’s meet on Sunday.’ How is this message delivered to Marie?