A sound card is a hardware device that enables a computer to produce and record sound. Synonyms for the term "sound card" include audio interface, sound adapter, sound module, and audio card. An audio interface is a device used to connect musical instruments and microphones to a computer. A sound adapter is a hardware component that enables a computer to connect to speakers and microphones. A sound module is a piece of hardware that produces high-quality sound. An audio card is a piece of hardware that processes audio files and produces high-quality sound output. All of these synonyms refer to hardware devices designed to improve computer sound quality and recording capabilities.