An instrument cable connects a guitar, bass, keyboard, or other electronic instrument to an amplifier or preamp that’s intended for direct connection of an instrument. Instrument cables are designed to carry low-voltage instrument signals, and most often have 1/4" phone plug connectors. Depending on the location of the output jack on your instrument, you may want a male jack with a straight or right-angle connector. In deciding how long a cable to buy, keep in mind that longer cable runs are more prone to picking up interference.
Mic cables are shielded and balanced and typically have an XLR male connector on one end and an XLR female connector on the other. Some microphone cables have a TRS, mini plug, or USB connector on the delivery end for plugging directly into a computer sound card, DAW, or digital recording device. In addition to connecting a microphone to a sound system, mic cables are often used as longer, balanced patch cables—for example connecting a mixing board to powered speakers. They can also be used for D.I. connections between an instrument and a mixing console as well as for lighting effects with DMX control capabilities.
The term “patch cable” generically describes any cable that links various components together. They often are quite short in length and may be used in a PA or recording setups to interconnect gear, or to link effects pedals to each other in a signal chain. As you add pieces to your stage gear or studio setup, you will eventually need to connect equipment with incompatible jacks and cables.