What are mounted partitions in Debian?

Question

Debian

I'm using an OpenVZ-based VPS with 50GB of disk space initially ordered.
After some time, when checking its availability using the df command, I found an "additional" 189GB with mounted partitions that were incomprehensible to me:

# df -h
Filesystem         Size  Used Avail Use% Mounted on
/dev/named1234567   50G   16G   32G  33% /
none               189G  4.0K  189G   1% /dev
none               189G  1.2M  189G   1% /run
none               189G     0  189G   0% /run/lock
none               189G     0  189G   0% /run/shm
none               189G     0  189G   0% /run/user

At the same time, I first "discovered" /dev and /run, and the sections /run/lock /run/shm and /run/user "appeared" about two months later.
Naturally, they are not physically on the server. I suspect that this is something "virtual" from the hosting provider, but I myself am not strong in this.
Tell me what it could be and how much you need to worry / pay attention?

Answer 1

/run - pseudo-file system in RAM