The contact manager is a contact-centric database and softare program being used in most smartphones using the vCard, also known as VCF (Virtual Contact File) as the main reference standard for data.
A contact manager is a software program that enables users to easily store and find contact information, such as names, addresses and telephone numbers. They are contact-centric databases that provide a fully integrated approach to tracking of all information and communication activities linked to contacts. Simple ones for personal use are included in most smartphones. The main reference standard for contact data and metadata, semantic and interchange, is the vCard. vCard, also known as VCF (Virtual Contact File), is a standard for electronic business cards. The main reference standard is the vCalendar. 
