There are two main types of Realtek drivers you might encounter:
Windows can automatically find and install stable versions of the driver. Press to open Settings. realtek audio drivers
The physical layer consists of the Realtek codec chip soldered onto the motherboard. This chip contains the Digital-to-Analog Converters (DACs) and Analog-to-Digital Converters (ADCs). It connects to the system via the PCI Express bus or the High Definition Audio (HDA) link. There are two main types of Realtek drivers
High-end Realtek chipsets (such as the ALC1220 found in gaming motherboards) support licensing for Dolby Digital Live or DTS Connect. The driver package includes encrypted modules that encode audio streams in real-time for output via optical (S/PDIF) connections to external receivers. realtek audio drivers
This error means Windows cannot see the Realtek hardware chip.