Windows 10 version 21H1 is Microsoft's latest update to the OS, and started rolling out on May 2021. It's also called the Windows 10 May 2021 update. This update also contains all features and fixes included in previous cumulative updates to Windows 10, version 20H2.

Here are the full new features of the Windows 10 May 2021 Update (version 21H1):

1. Windows Hello multicamera support: Windows Hello multicamera support to allow users to choose an external camera priority when using high-end displays with integrated cameras.
2. Windows Defender improvements: Windows Defender Application Guard performance improvements including optimizing document opening scenario times.
3. Windows Management Instrumentation (WMI) Group Policy Service (GPSVC) updating performance improvement to support remote work scenarios.

There will also be the usual bug fixes, with Windows Latest reporting on a preview build which irons out long-standing issues with the File Explorer and improves its performance.