What is the main purpose of a sound card in a computer system?

The main purpose of a sound card in a computer system is to provide sound output and input. This specialized hardware component allows for the generation and manipulation of audio signals, enabling the computer to produce sound that can be played through speakers or headphones, as well as allowing for audio input through devices like microphones.

The sound card converts digital audio data into analog signals that can be heard, supports various audio formats, and often includes software drivers that facilitate audio playback and recording. This function is essential for applications such as music playback, video games, and video conferencing, where audio quality and input capability are crucial for a complete user experience.

In contrast, the other options pertain to different functions within a computer system: processing graphics is handled by a graphics card, managing power supply is a role filled by the power supply unit, and connecting to external storage is typically performed by various ports or interfaces like USB or SATA. These distinctions underscore the unique role of the sound card in enhancing audio capabilities within a computer.