Not just log files, but any variable/dynamic data used by packages installed on the system: caches, databases (like /var/lib/mysql for MySQL), Docker volumes, etc.
Traditionally, /var and /home are parts of a Linux server that use the most disk space, which is why they used to almost always be separate partitions.
Also /tmp is often a RAM disk (tmpfs mount) these days.
Not just log files, but any variable/dynamic data used by packages installed on the system: caches, databases (like /var/lib/mysql for MySQL), Docker volumes, etc.
Traditionally, /var and /home are parts of a Linux server that use the most disk space, which is why they used to almost always be separate partitions.
Also /tmp is often a RAM disk (tmpfs mount) these days.
And in immutable distros, one of the few writable areas
True.