The difference between a URL and a URI

Uri-universal Resource identifier Generic resource identifier
Every resource available on the Web, such as HTML documents, images, video clips, programs, etc., is a URI to locate.
URIs are generally made up of three parts
① naming mechanism for accessing resources
② host name of the storage resource
The name of the ③ resource itself, represented by a path, with emphasis on resources.

Url-uniform Resource Location Uniform Resource Locator
URLs are strings used on the Internet to describe information resources, mainly used in various WWW client programs and server programs, especially the famous mosaic.
URLs can be used in a unified format to describe various information resources, including files, server addresses and directories.
URLs are generally made up of three parts
① Protocol (or service mode)
② Host IP address (sometimes including port number) for this resource
③ the specific address of the host resource. such as directory and file name, etc.

The difference between a URL and a URI