Businesses often purchase specific products to protect their operations. These products include boiler and machinery coverage, which protects against damage to equipment, and business interruption coverage, which compensates for lost income due to a covered event. Other important coverages include commercial auto, general liability, directors and officers liability, fire and allied lines, inland marine, medical malpractice liability, product liability, professional liability, surety and fidelity, and workers compensation. While most of these coverages can be purchased separately, business interruption coverage must be added to a fire insurance policy.