I was reading about network Cables then I saw some information that made me feel confused for example : if we say have a we have copper wire (e.g. Twisted pair) that can achieve a flow rate of 10 Mbps , does that mean that the speed of the cable is 10 Mbps which implies that it can send 10 Mega bits of data from the source to the destination every one second ? or does this number mean that every one second this cable can hold data of 10 Mega bits in other words it is like 10 Mega bits can travel inside the cable at the same time (i.e. capacity )
then I passed through a term called "Propagation Speed " which is 2 * 10^8 m/s in copper wires , so what is the relation between the two terms ?
Any explanation that includes example would be very helpful
P.S: Sorry for my bad English