Basically, an address book is a database of names and addresses, a means to keep records about people and companies. Each address book record (headed with contact's name) usually includes a number of contact details: mailing address, telephone number mobile phone number, fax number, email address, website URL, birthday date, etc. Details are normally stored in alphabetical order of people's names.
Your Fotki Address Book is a software designed to hold every piece of information you would ever wish to record. The address book is easy to use both by itself and in connection with your Fotki email account.