A PCI Express SSD/NVMe/NGFF card is an expansion card that allows you to add additional storage to your computer using the PCI Express (PCIe) interface. Here's what each term means:

1. **PCI Express (PCIe):** PCIe is a high-speed interface used for connecting various components, including graphics cards, network cards, and storage devices, to the motherboard of a computer. PCIe offers faster data transfer speeds compared to traditional interfaces like SATA.

2. **SSD (Solid State Drive):** An SSD is a storage device that uses flash memory to store data. SSDs are faster, more reliable, and consume less power than traditional hard disk drives (HDDs). They are commonly used to improve system performance and reduce boot times.

3. **NVMe (Non-Volatile Memory Express):** NVMe is a protocol designed specifically for SSDs to take advantage of the high-speed PCIe interface. NVMe SSDs offer even faster data transfer speeds and lower latency compared to SATA SSDs.

4. **NGFF (Next Generation Fo