As said earlier, the three basic types of SSD storage are 2.5-inch SATA SSD, M.2 SATA or M.2 NVMe SSD, and PCI Express SSD.
However, based on their performances, the SSDs can also be tiered as SATA SSDs, NVMe Gen 3 SSDs, and NVMe Gen 4 SSDs, in that order usually.