What is the name of the macOS disk management application?

The macOS disk management application is called Disk Utility. It is Apple's built-in graphical tool for working with internal drives, external disks, volumes, disk images, and partitions.

Disk Utility can erase and format storage, create or resize partitions, mount and eject volumes, create disk images, and check or repair certain file-system problems. Its command-line counterpart is diskutil, which provides many of the same capabilities for scripting and advanced administration. Disk Utility is therefore more than a simple drive browser: it operates at both the physical-disk and logical-volume levels.

Its history reaches back to earlier Mac tools. In classic Mac OS, Disk First Aid handled verification and repair, while Drive Setup handled formatting and partitioning. Over time, Apple consolidated these functions into Disk Utility. The application has changed significantly across macOS releases; for example, the El Capitan redesign removed some older features, including permission repair and several RAID-management functions.