URIs

Uniform Resource Identifiers (URI) are used to identify "resources" on the web.URIs are commonly used as targets ofHTTP requests, in which case the URI represents a location for a resource, such as a document, a photo, binary data.The most common type of URI is a Uniform Resource Locator (URL), which is known as theweb address.

URIs can be used to trigger behaviors other than fetching a resource, including opening an email client, sending text messages, or executing JavaScript, when used in other places such as thehref of an HTML<a> link.

Reference

TheURI 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, andport.
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.
Query: The section after the path.Contains non-hierarchical data to identify a resource within the scope of the URI's scheme and naming authority along with data in the path component.
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.