A chunk of information sent over a network. Always contains destination address and address of sender, plus other information. Post Office Protocol. Used by mail servers on the Internet. Allows Mac and PC users to pick up mail and download it.
Protocols make the Internet work.
A device that examines the destination address of a packet and selects the most effective route. A computer which provides a service to other computers on a network. The understanding is that, in some cases, people pay for the software if they decide to keep it. SMTP Simple Mail Transfer Protocol. Method by which Internet email moves from one computer to another.