vCard
In plain terms
A standard file format for electronic business cards.
Going deeper
vCard encodes contact information, names, phones, emails, in a portable format exchangeable between apps and devices. It standardizes contacts.
Under the hood
The .vcf format carries structured contact fields; used when sharing or importing contacts.
Examples
.vcf files, contact sharing, address books, email signatures, phone contacts.
Think of it like...
Like a digital business card any address book can import.