TRIM Command
A deallocation hint by which an operating system or file system tells an SSD that selected logical blocks are no longer in use; it is not by itself verified media sanitization.
TRIM lets the host tell a solid-state device that selected logical blocks are no longer needed. That information can help garbage collection and free-space management, but issuing the command does not prove that specific NAND cells were physically erased at that moment.
The controller can remap data through the Flash Translation Layer and schedule physical erase work independently. TRIM is therefore a deallocation and performance mechanism, not a complete sanitization proof.
For stronger device-level operations see NVMe Sanitize; SSD and NVMe Media Sanitization and Cryptographic Erase compares the resulting security boundaries.