It helps protect you because if the application in question is compromised in any way (or has a flaw, i.e. an accidental rm -rf /*), the only access it has is limited to the user it is run as. If it is run as root, it has full administrative privilege.
It helps protect you because if the application in question is compromised in any way (or has a flaw, i.e. an accidental
rm -rf /*
), the only access it has is limited to the user it is run as. If it is run as root, it has full administrative privilege.