I'm trying to connect this servo to my RPi3 with as little wire as possible. What is this red, black, green wire called that allows me to connect a servo to my Pi?
Buying jumper wires premade would do the job. If you really want to make them yourself you need some hookup wire and some dupont/rectangular connectors. There's a crimp tool that goes with them, but generally I just use a dab of solder and some fine pliers to close the crimp. They're finicky though - a millimetre out of place into the metal part with the solder and it won't fit into the plastic housing.