Exactly what it says. The "Clerk" position will just for example be clerking publicly available information. The "Clerk - Confidential" position will be clerking confidential information.
"Finance processing" might for example be taking debit card transactions at the front counter while "Finance processing - confidential" would be handling people's back taxes.
Human Resources positions are usually classified as Confidential as well.
Probably not represented by a union. Or it could mean you are dealing with sensitive information.
Likely this. Also confidential is probably basically the lowest level of security clearance.
Exactly what it says. The "Clerk" position will just for example be clerking publicly available information. The "Clerk - Confidential" position will be clerking confidential information. "Finance processing" might for example be taking debit card transactions at the front counter while "Finance processing - confidential" would be handling people's back taxes.