In addition to regular storage hard disk drives (HDDs), vSphere supports flash storage devices.
Unlike the regular HDDs that are electromechanical devices containing moving parts, flash devices use semiconductors as their storage medium and have no moving parts. Typically, flash devices are very resilient and provide faster access to data.
To detect flash devices, ESXi uses an inquiry mechanism based on T10 standards. The ESXi host can detect flash devices on a number of storage arrays. Check with your vendor whether your storage array supports the ESXi mechanism of flash device detection.
After the host detects the flash devices, you can use them for a variety of tasks and functionalities.