A circuit board that enhances the functions of a component of a system unit and provides connections to peripheral devices.

To connect to Bluetooth devices such as Bluetooth mouse

i) to connect musical instruments such as electronic guitar or MIDI keyboard ii) used in creating digital music.

allows a computer to send and receive data through telephone or cable lines.

To connect to other computers and peripherals via a network cable.

provides enhances graphics capabilities such as accelerated processing or the ability to connect a second monitor.

Connects to a digital video camera, television or DVD player and convert analog signals int digital form and compresses data.