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A domain for a website is the unique URL you type into your web browser to open a particular web page. The URL for a website has number of parts:

Protocol or scheme

Subdomain

Domain name, also known as second-level domain

Top-level domain (TLD)

Subdirectory or Page path

The majority of people be paying attention to the domain name, the pages, and TLD. The domain name is the distinctive identifier of your site ("" for .com) while the TLD is your domain's extension (like .com, .net, or .org) while the page path represents an individual page that you have on your site (like "/blog" in .com/blog).