Professionals need this type of insurance. If you work in a field where you give advice or provide services to others, you may be at risk for a professional liability claim. Even if you are careful and do your best to provide quality services, mistakes can happen. If one of your clients claims that you made a mistake that cost them money or caused them some other type of harm, they could sue you. Professional liability insurance can help protect you financially if you are sued for these types of claims.