Disk Space - Mac Book Pro
The /private/var/vm is the macOS virtual memory. It's a special type of file, which is mapped on your Macbook's 234 Gb (formatted capacity) SSD. In short, virtual memory is used when your RAM is full of apps and portions of it is "swapped" to the SSD.
So, your Macbook Pro has only one SSD drive.

If you have Homebrew installed, you can install ncdu with this command in Terminal:

brew install ncdu


and then you can use it in the terminal with:

ncdu 

to see where your Macbook's disk space went.

You can see additional options by pressing ? while running ncdu.