Analog audio (standard green headphone jack) converts digital files (MP3, FLAC) to analog signals inside your computer case, which is an electrically noisy environment full of interference from the GPU, CPU, and fans.
Digital Output bypasses this entirely. It sends the raw 0s and 1s optically or coaxially to an external device (soundbar, AV receiver, or dedicated DAC). That external device then performs the digital-to-analog conversion in a clean, shielded environment. realtek digital output better
Theoretical Advantage: Zero electrical noise, no ground loops, and perfect channel separation. To understand why one output might be better
To understand why one output might be better than the other, you must understand the Digital-to-Analog Converter (DAC). humans cannot hear binary
Computers store audio as binary code (0s and 1s). However, humans cannot hear binary; we hear sound waves, which are analog signals. Therefore, digital data must be converted into an analog electrical signal before it can be played through speakers or headphones.
This is the secret to audiophile-grade sound.