Fast start-up, loading and file transfers.
More reliable and durable than a hard drive.
Multiple capacities with space for applications or a hard drive replacement.
SA400M8/120G is a so-called M.2 SATA SSD drive which requires a corresponding M.2 SATA slot for compatibility – there are also M.2 NVMe slots which from the outside are identical to M.2 SATA slots, but will internally not work with M.2 SATA SSDs
Note Please check the compatibility of your motherboard before purchasing!