Professional indemnity insurance is designed for professionals who provide advice or services to their customers. It protects your business against legal costs and claims by third parties for damages arising from acts, omissions or breaches of professional duty in the course of your business.
In real terms, this means that if you do something (or neglect to do something) in the course of your work, and a customer suffers injury or financial loss as a result, they may take legal action against you. With the right policy, you can defend your business against the claim and prevent financial loss.