About the Address Book 

An address book is a book or a database used for storing entries called contacts. Also, groups of contacts can be created within which existing contacts can be included. Each contact entry usually consists of a few standard fields (for example: first name, last name, company name, address, telephone number, e-mail address, mobile phone number). These Contacts are stored as Collection users with various levels of access. Depending on the Role given to these Contacts and the level of access privileges, Contacts will be able to perform activities across various Collection functionalities.