Definition: "Sound card" refers to a device that converts electronic sound waves into electrical signals used by computers, audio systems, and other devices for playback or recording purposes. The term often includes a specific type of hardware called a "card" (such as a PCI or MIDI), which is not directly related to sound in the sense typically associated with it. The definition of "sound card," then, is: - A device used by computers and other electronic devices to receive and output digital audio signals from an analog audio source. - The specific hardware component that does this, such as a PCI or MIDI interface card on a computer.