What is the name of the Windows tool for managing disk partitions?

The Windows tool for managing disk partitions is called Disk Management.

Disk Management is a graphical system utility for viewing disks and volumes and performing storage operations such as creating, deleting, formatting, shrinking, and extending partitions. It can also assign drive letters and initialize newly installed disks.

The utility is commonly opened by searching for “Disk Management,” choosing “Create and format hard disk partitions,” or entering diskmgmt.msc in the Run dialog. It is also available as a snap-in inside Computer Management, which is built on the Microsoft Management Console framework.

A common mix-up is confusing Disk Management with DiskPart. DiskPart is a separate command-line utility that can perform many overlapping tasks, while File Explorer mainly handles files and folders. Device Manager manages hardware and drivers, and Task Manager monitors running processes and system performance rather than partitions.