If you provide any type of advice, expertise or professional service, you risk being sued by a customer, client or other party who claims he or she was injured due to your negligent act, error, or omission. This type of negligence is sometimes referred to as malpractice.  Professional Liability Insurance, also called Errors and Omissions Liability Insurance, pays the cost of your defense and any damages awarded, up to policy limits. Insurance companies have developed many specialized policy forms that respond to the individual risks characteristic of particular professions and services.