Official contacts These are people you want to be able to send reports to such as an employer or job coach.
Company contacts You can add employer details here. The employers details are added automatically to the list when you make a job application (See APPLICATIONS menu at the top) if the [Add to my contacts] box is checked.
Private contacts You can add people that you would like to be able to contact with your on-line address book. This could be your doctor or lawyer or friend.