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A domain for a website is the unique URL you type into your browser in order to open a particular web page. A URL for a web page has couple of components:

Schema or protocol

Subdomain

Domain name, also known as second-level domain

Top-level domain (TLD)

Subdirectory or Page URL

The majority of people be paying attention to the domain name, the TLD, and page paths. Your domain name is your unique identifier for your website ("" for .com), whereas the TLD is your domain's extension (like .com, .net, or .org) as well as your page path will be the URL of your site (like "/blog" on .com/blog).