What's a Jumper Wire?

A jump wire is an electrical wire, or group of them in a cable, with a connector or pin at each end, which is normally used to interconnect the components of a breadboard or other prototype or test circuit, internally or with other equipment or components, without soldering.

What is the point of a jumper wire?

Jumper wires are simply wires that have connector pins at each end, allowing them to be used to connect two points to each other without soldering. Jumper wires are typically used with breadboards and other prototyping tools in order to make it easy to change a circuit as needed. Fairly simple.

Can I use a paperclip as a jumper wire?

A paper clip is fine but tends to pop out unless you really bend it correctly. No need to ground out, just shove it in.