Dev Drives are virtual drives introduced in the Windows 11 version 22H2 update, designed specifically for software development. They can be created as partitions on physical drives or as virtual hard drives (VHDs) and use the ReFS file system instead of NTFS. This allows them to bypass continuous malware checks by Microsoft Defender, resulting in performance improvements of up to 41%. Dev Drives are intended for developers engaged in data-intensive tasks, but storing non-development files on them poses security risks. They can enhance workflow efficiency for developers and are accessible through the Settings app in Windows 11.