What is the purpose of the additional (other than sda1, sda2... etc) filesystems mounted on my system?

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For example, if I run the df command, the result looks something like this:

Filesystem      Size  Used Avail Use% Mounted on
dev              16G     0   16G   0% /dev
run              16G  1.6M   16G   1% /run
tmpfs            16G     0   16G   0% /dev/shm
tmpfs            16G   51M   16G   1% /tmp
tmpfs           3.2G   76K  3.2G   1% /run/user/1000

There are other entries in the table, but those corresponds to the standard stuff (sda1, sda2, etc.)

I assume that the size of the tmpfs temporary filesystems corresponds directly to my RAM? Since I have 32 gigs on my system.

Since the results will look different if I run the df command on other distributions, I’m assuming that these filesystem has some kind of distribution-dependent functions?

What are these filesystems for, and how do they work?

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