A banana plug is a device used to join electrical cables to other devices, typically used in laboratory equipment and professional audio and video applications. It is so named because of its shape that resembles a banana. Generally, these connectors have two terminals, one of them is a female plug terminal and the other is a male banana terminal, the terminals are usually in two colors, red and black, differentiated for positive charge and negative charge.

Banana plugs are used to connect electrical cables to equipment, such as multimeters, oscilloscopes, power supplies, amplifiers, etc. They are also used to connect speakers and other audio and video devices. One of the advantages of banana plugs is that they provide a secure connection that is easy to make and break, making them ideal for applications where frequent plugging and unplugging is required.

There are different versions of banana plugs on the market, some with locking systems, others with stronger construction for harsh conditions, and some made of gold to improve conductivity.