What is the difference between user variables and system variables?

Question

What is the difference between user variables such as PATH, TMP, etc. and system variables?

I accidentally deleted the user variable

Answer 1

Just recreate the Path variable in users. Go to user variables, highlight path, then new, the type in value. Look on another computer with same version windows. Usually it is in windows 10: Path %USERPROFILE%\AppData\Local\Microsoft\WindowsApps;