If you are considered a “professional”, in that a) you have specific training in a special area of expertise, b) you operate your own business, and c) you are the key person who performs these skills, Professional Liability Insurance is advised to protect you against lawsuits due to negligence or harm. Standard homeowner’s policies and Business Owner’s policies will not offer this type of protection.
If your company is a “solutions” or “service” provider, such as a consultant, marketer, designer, or software developer, you are at risk of being sued by a customer claiming that you did something incorrectly that has caused them financial loss. Errors & Omissions (E&O) Insurance is available to you, again, above and beyond your General Liability policy, to cover many of the costs of a legal defense and the subsequent ruling (in the case you are found at fault).