These are some, but not all, of the components of a vCard file:
N: The name of the person or organization represented by the vCard, in a structured format: family name, given name, additional (middle) names, any honorific prefixes (Mr., Dr., Miss, etc), and any honorific suffixes (Jr., III, Ph.D., etc).
ADR: Physical address. There may be one or more addresses in a vCard; one for home, one for work, one for deliveries, and so on. The ADR element has structured components for p.o. box, extended information, street, city/locality, state/region, postal code, and country.
TEL: Telephone. There may be one or more telephone numbers in a vCard; one for home, one for work, one for fax, and so on. The TEL element has a single text value indicating the phone number.
EMAIL: Email address. There may be one or more email addresses in a vCard; one for home, one for work, and so on. The EMAIL element has a single text value indicating the email address.
URL: One URL associated with this vCard; e.g., a personal or organizational home page.
ORG: The organization in which this vCard is a part. There may be one or more suborgnizations as well.
TITLE: A single job title.
ROLE: A single, longer description of the job role. Whereas TITLE might be "Senior VP Of Custodial Enforcement" the ROLE might be "Sweep floors, empty trash, etc."
CATEGORIES: The category or categories of this vCard: Personal, Business, Family, and so on.
BDAY: Birthday in yyyy-mm-dd format. It might also have additional time and timezone information.
PHOTO, LOGO, KEY, SOUND: Respectively, a binary-encoded file for a personal photo, corporate logo, encryption key, or name-pronounciation sound associated with the vCard. The information may also be a URI link to a binary file.
NOTE: Any other arbitrary information you might want to keep with the vCard.