list all specifications of the m2 pcie standard. And list which SSDs are compatible/interchangeable
The M.2 PCIe standard is a high-speed, low-latency interface for solid-state drives (SSDs) and other devices. Here are some of the key specifications:

- Form factor: The M.2 standard defines a small, rectangular form factor that is typically 22mm wide and either 30mm, 42mm, 60mm, 80mm, or 110mm long.
- Interface: M.2 SSDs use the PCIe interface, which provides much higher speeds than the older SATA interface. Specifically, M.2 PCIe SSDs use either the PCIe 3.0 or PCIe 4.0 standard.
- Connector: M.2 SSDs have a keying notch that aligns with a corresponding key on the M.2 slot to ensure proper installation. The keying notch can be A, B, M, or B+M, which corresponds to the number of PCIe lanes and the supported functionality.
- Speed: M.2 PCIe SSDs can provide read/write speeds of up to 7 GB/s, depending on the PCIe version and the number of lanes used.

As for compatibility, M.2 PCIe SSDs are interchangeable with any device that supports the M.2 PCIe standard. This includes many modern desktop and laptop motherboards, as well as some high-end gaming laptops and ultrabooks. However, it's always a good idea to check the manufacturer's specifications to ensure compatibility. Additionally, some M.2 PCIe SSDs may require a heatsink or other cooling mechanism to prevent overheating, so be sure to check the requirements before purchasing.
Could you present the information in layman's terms? something simple enough that anyone could understand it. Thanks