The sound card is an expansion card that allows the computer to send audio information to an audio device, like speakers, a pair of headphones, etc.
Unlike the CPU and RAM, the sound card isn't a necessary piece of hardware required to make a computer work.
The terms audio card, audio adapter, and sound adapter are sometimes used in place of sound card.
Sound Card Description
A sound card is rectangular piece of hardware with numerous contacts on the bottom of the card and multiple ports on the side for connection to audio devices, such as speakers.
Since the motherboard, case, and peripheral cards are designed with compatibility in mind, the side of the sound card fits just outside the back of the case when installed, making its ports available for use.
There are also USB sound cards that let you plug headphones, microphones, and maybe other audio devices into your computer through a small adapter that can plug directly into a USB port.
Sound Cards and Audio Quality
Many modern computers don't have sound expansion cards but instead have the same technology integrated directly onto the motherboard, therefore called on-board sound cards.
This configuration allows for a less expensive computer and only a slightly less powerful audio system. This option is wise for nearly every computer user, even the music fan.
Dedicated sound cards, like the one shown here on this page, are usually only necessary for the serious audio professional.
Since most desktop cases are set up for the front-facing USB ports and headphone jacks to share a common ground wire, you may hear static in your headphones if you also have USB devices plugged in.
You should be able to mitigate this interference by either refraining from using those USB ports at the same time that you use headphones, or by running a male to female extension cable from the sound card at the back of the computer to your headphones.
"My Computer Has No Sound"
Although it's possible that the sound card or speakers/headphones have disconnected from their ports/power and are no longer communicating with each other, it's usually something software related that's preventing the sound from playing.
The first thing you should do is the obvious: make sure the volume of the video, song, movie, or whatever you're trying to listen to, isn't muted. Also check that the system sound isn't muted (check the sound icon on the taskbar down by the clock).
If after checking all of the above, your computer still won't play sound, you might just not have the proper software installed for media playback. See our Free Audio Converter Software Programs list to convert the audio file to another format that your media player can recognize.
More Information About Sound Cards
Most computer users know that they must plug in their speakers to the back of the PC in order to hear and control sound played from the computer. Although you may not use all of them, other ports often exist on a sound card for other reasons.
For example, there may be ports for a joystick, microphone, and an auxiliary device. Still other cards may have inputs and outputs designed for more advanced tasks such as audio editing and professional audio output.
These ports are sometimes labeled to easily identify which port belongs to each device.
Buying a Sound Card
The 5 Best PC Sound Cards of 2020
Installing a sound card is relatively easy. However, unlike external peripheral devices that can be attached on the outside of the computer, if it's not already clear, a sound card is connected on the inside.
Not sure what slots you have open on your motherboard? A system information tool can be super helpful in identifying that information and much more.
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