Commercial Insurance is a contract between an insurer and a business owner whose purpose is to minimize the owner's risks against losses, whether from weather, theft, vandalization, lawsuits, accidents or any other reason. There is a cost for this "hedge," which is referred to as a premium; so in essence, the potential for a greater (possibly devastating) loss is reduced to a smaller loss (the cost of the premium).
Any business owner benefits from commercial Insurance since it reduces the risk he may encounter. He can insure his company's assets, real estate and the health of all of his employees (by offering group health insurance). If the business owner is an attorney, property appraiser or other professional who gives advice and writes and administers contracts or other binding written business, he will benefit from having Errors and Omissions Insurance. If he is a physician, he can insure his ability to diagnose and treat diseases and/or successfully perform surgeries by having Malpractice Insurance, which covers losses due to patient lawsuits.