It depends on who you ask. -- According to the W3C, it used to be that: > a URI was either a URL or a URN. But now, it’s complicated: > the view became tha

It depends on who you ask. -- According to the W3C, it used to be that: > a URI was either a URL or a URN. But now, it’s complicated: > the view became that an individual scheme does not need to be cast into one of a discrete set of URI types such as "URL", "URN" […] > Further according to the contemporary view, the term "URL" does not refer to a formal partition of URI space; rather, URL is a useful but informal concept […] > Thus as we noted, "http:" is a URI scheme. An http URI is a URL. All the above citations from https://www.w3.org/TR/uri-clarification/ https://www.w3.org/TR/uri-clarification/ -- The WHATWG holds a different view: > Standardize on the term URL. URI and IRI are just confusing. […] URL also easily wins the search result popularity contest. From https://url.spec.whatwg.org/ https://url.spec.whatwg.org/ This may be what the author of the article had in mind.