it is the system folder that exists on the computer with the installation of the windows operating system and contains dll files and exe utilities for the computer to run properly. some programs installed on the computer after the installation of the operating system can also put their own dll files in this folder. it is an extremely important directory for the windows operating system to work properly.
the folder containing the drivers, updates, msi-packed installation files of the window. it is not as big as it seems. the reason it is reported as large is because some driver packages are saved to system32 via hardlink.
windows xp has a folder called dllcache to repair itself, while there is no dllcache in windows vista and later systems, instead there is a restriction on the files, so you cannot delete them.
it seems to me that there is a lot of system incompatibility with the programs that haunt this folder.