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URIs | MDN
The URI reference provides details about the components that make up a URI.
Schemes
The first part of the URI, before the : character, which indicates the protocol the browser must use to fetch the resource.
Authority
The section that comes after the scheme and before the path.
It may have up to three parts: user information, host, and port.
Path
The section after the authority.
Contains data, usually organized in hierarchical form, to identify a resource within the scope of the URI's scheme and authority.
Fragment
An optional part at the end of a URI starting with a # character.
It is used to identify a specific part of the resource, such as a section of a document or a position in a video.
The URI guides help you work with URIs on the web.
Choosing between www and non-www URLs
Guidance on when sites should use a www. prefix in URLs (www.example.com vs example.com).
