Drivers are essentially pieces of software that allow other types of software to talk to the hardware on a computer. They affect different aspects, so you might have one set of drivers that talk to the keyboard drivers, another that talk to the video drivers, and a third to the audio set-up, etc. You need to keep them updated to ensure they're working effectively, which is why you might think of downloading Realtek Audio Drivers.
Depending on your computer, interacting with your drivers will be more or less easy. Some users will be able to use a Windows Store app called Realtek Audio Console. Others will need to interact with the drivers by accessing the Realtek program files and opening RtkNGUI64, while yet more people will need to access the Realtek Audio HD manager via the control panel. This variety of options is confusing, and the fact that it is hard to know which one will work for you means that only users who are very interested in their audio set-up will bother following it through to the bitter end.
For the rest of us, editing Realtek HD Audio Drivers will seem like a boring step too far. If you think that might be you, ignore them and cross your fingers your audio never gives you any trouble. You might get lucky, and be able to sidestep driver confusion completely.
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