Fidelity Guarantee comes most of the time as a complement of your Property All Risks policy.
If with your Property All Risks insurance you are covered from burglar or theft from thirds party. This policy does not cover such act when they come from one of your employee.
Therefore, Fidelity Guarantee Insurance protects your business against the loss of money or any of your company asset which you may suffer following a fraudulent and/or dishonest by one of your staff or a group of employee.
Also, this line of insurance is known as Employee Dishonesty cover or referred as fidelity bond, crime coverage, and crime fidelity insurance.