Connectors are called banana plug because when they are assembled they resemble the shape of a banana. The springs are meant to hold the connector tightly when inserted into an equipment and collapse to quickly allow users to pull the plug out. Since sound systems are also needed to be installed at remote places or mobile stages, the equipment requires time efficiency and banana plugs are the best connectors for this task.
Banana plugs are used in sound systems or equipment. They allow users to connect equipment and systems and since they are easy to remove, the entire network can be disassembled quickly as well. The plugs are purposefully made to facilitate sound system engineers as such equipment has frequent outdoor use and installation, and networking and collecting the entire system can consume a lot of time.
These connectors come in different varieties; some are even designed to allow multiple connections at the same time. Some are simple connectors, connecting two single wire connections, but some are designed according to the specific requirement of a sound system, such as having multi-connection capacity. They can further be modified as per demand of the environment.
Banana plugs also come in a number of qualities. Those with gold plating have minimum corrosion, although these kinds are the most expensive ones. The choice for these will depend on the quality of conduction you want to create and if you are willing to spend some money, these connectors are the best in the lot. Otherwise, you can find connectors made of other metal materials. It totally depends on you and the task for which you need them.