An address book is typically a collection of contacts, where each entry has several fields, like first name, last name, full address, phone number(s), e-mail address, fax number, and so on.
There are numerous software applications that help users manage their address books, allowing them to add custom fields to the entries, like business phone number, personal website or birth date.
Some of these apps support vCards, enabling users to export vCards from their cell phones or PDAs, and import them to the software, so that they can be organized, edited or deleted.
Additionally, address books also offer users the possibility to add personal notes to each contact.
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