If you are giving advice or offering services then this is the cover for you. This will protect you against legal costs and claims for damages caused to third parties which may arise out of mislead advice.
Regardless of how many years experience your firm may have, there is always the possibility you (or one of your team) could make a mistake. Professional indemnity insurance covers against a wide range of scenarios, including:

• Professional negligence (i.e. making a mistake in a piece of work for a client)
• Loss of documents or data
• Unintentional breach of copyright and/or confidentiality
• Defamation and libel
• Loss of goods or money (your own or for which you are responsible).