what is SD card, eMMC, NAND interface?

How do I communicate (interact) with:

1) microSD card
2) eMMC
3) NAND Flash
4) Most flash memory units

I know we can interact with a microSD card through SDIO or SPI (not recommended).
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nociSoftware EngineerCommented:
Depends..., on laptops mostly there is a USB involved.  and a USB -> MMC or SD controller.
Raspberry Pi uses GPIO. for uSD.
JohnEshAuthor Commented:
I want to communicate using a SOC or MCU chip.
Also, I don't want to use a USB bridge (i.e. USB to eMMC bridge). I want to directly connect to my flash memory (NAND Flash, eMMC, etc.)
nociSoftware EngineerCommented:
Look f.e. at this design: https://www.raspberrypi.org/documentation/hardware/computemodule/cm-designguide.md
The cpu has the right interface itself. (Actualy maybe this is a nice platform to start from?)...
Cheapest without ethernet is about $5,-- ex transport cost.

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