macOS High Sierra 10.13.1 fixed the KRACK (Key Reinstallation Attack) vulnerability, which affected WPA2 (Wi-Fi Protected Access 2) protocol. This was a critical security update that helped protect Mac users from potential Wi-Fi network exploits.

: Optimized for SSD storage, making common tasks like duplicating files and finding the size of a folder nearly instantaneous.

If you are restoring a legacy Mac (mid-2012 to late-2018 models) and need a stable, pre-Mojave environment, 10.13.1 is a solid choice. However, note that Apple no longer signs older versions. You cannot download 10.13.1 directly from the App Store; you will instead be offered 10.13.6 (the final High Sierra update).