|An ethernet cable/connector resembles a slightly larger phone plug...|
There are two kinds of usb connector (at least for usb-1 and 2; usb-3 is slightly different - again).
A usb standard cable/connector (be it usb 1 or 2) is either similar size and style at both ends of the cable; or one end is the very common (larger) style) and the other a much smaller quite different looking one - and they are tagged/labeled variously
If you go into any computer store and have a look-see/browse you will see both types available. Often one of the smaller connector types (aka mini B) is also used on many phones, many external hard drives too.
Older usb devices used the "standard" shall I say larger - connectors as their input (or output); whereas more recent kit often uses connectors that are smaller connector (min B) at the input at least. Computers all use the standard/larger stye of socket and thus cable end...
This link describes and shows the various types around: