Sound cards are special expansion cards that you can add for better audio performance. These are specially designed to process audio signals and give you a more powerful and clean signal that really makes a difference especially if you have good speakers connected to it. They usually come with software to take full advantage of your audio settings on the computer. If you really want to hear every detail in your music or the game you might be playing. Consider a sound card. They usually come as internal cards, or external boxes that can be connected with a USB cable.