Identificador uniforme de recursos(A character string used to identify a resource (such as a file) from anywhere on the Internet by type and location. The set of Uniform Resource Identifiers includes both Uniform Resource Names (URNs) and Uniform Resource Locators (URLs))
Localizador uniforme de recursos(An address that uniquely identifies a location on the Internet. A URL is usually preceded by http://, as in http://www.microsoft.com. A URL can contain more detail, such as the name of a page of hypertext, often with the file name extension .html or .htm)
Nombre de recursos uniforme(A scheme for uniquely identifying resources that may be available on the Internet by name, without regard to where they are located)