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The Structure of the Internet

Internet: A network of computers and computer networks using unique IP and TCP/IP.

WWW: World Wide Web; a system of interlinked hypertext documents accessed via the internet; also called the web.

Intranet: a private computer network used to share information or operations within an organisation.

A packet or datagram is the unit of data transfer on the internet.
It has three parts: Source Address, Destination Address & Payload (the data)

IP address: a unique address that identifies a computer or other electric device on a network.

Domain Name: a name that identifies one or more IP addresses, e.g. the domain name represents several IP addresses.

URL: uniform resource locator; a URI that identifies a resource by its network location.
It consists of: a protocol (HTTP), world wide web server and path

Internet Service Providers (ISP)
a business or organisation that sells people internet access.

Server: a software process that provides a service requested by a client
Client: a software process that requests and uses the service provides by the Server.

Protocol: a set of agreed signals, codes and rules for data exchange between systems.