For a gigging musician, wireless systems are ideal as they do away with the need for a lead between the guitar and amplifier. A wireless guitar system consists of the transmitter which is connected to the guitar and the receiver connected to the amplifier.
Sound quality is not affected when using a wireless system and as technology has evolved they have become much more affordable. If any other band member uses a wireless system, you must sure that yours operates on a different frequency so always check before you decide to buy one. You CANNOT operate two on the same frequency.