Network addressing concepts
There are different types of network addresses. An address serves to identify a node in a network. For example, the Internetwork Packet Exchange (IPX) protocol was an earlier protocol that was used to access nodes on a network. The X.25 is a protocol suite for Wide Area Network (WAN) packet switching. A MAC address provides a unique identifier for network interfaces at the physical network level. However, our primary interests are IP addresses.
These terms are used to refer to the name and location of an Internet resource. A URI identifies the name of a resource, such as a website, or a file on the Internet. It may contain the name of a resource and its location.
A URL specifies where a resource is located, ...