[MainFrame65]

"... If you have only one computer in your home or office, you will not need or use ethernet. ..."

True if you will use only a dialup connection, otherwise possibly false. If you intend to use either cable or DSL service instead, the service provider will require a
converter/router interface box (incorrectly referred to as a modem) that probably will have one or more ethernet ports for your computer(s). I have heard that some might offer a USB connection, but you would have to ask.

[Tumbleweed_Connection]

I've read the entire thread and didn't see anything about wireless. The applications are invaluable both at home and in the office.