SSD Upgrades or Solid State Drives come in two forms.
The fastest and newer models are NVMe modules. In appearance these look more like Memory Modules. The port is usually fixed into the Motherboard of compatible PC’s and they don’t rely on cables like older SATA Drives. Most modern PC and Notebooks come with NVMe modules as these things are fast, really fast. Like never wait for your hard drive again fast!
SATA or Serial ATA are the older forms of drives and were designed to replace the SATA mechanical drives that they succeed. SATA still has a place in some new computers especially if you opted for the more budget-conscious PC. This also makes SATA drives the most popular choice when it comes to upgrading old mechanical drives.