Which format is commonly used for synchronization with contact management software?

The most suitable format for synchronization with contact management software is vCard. vCard is specifically designed for electronic business cards, allowing storage of contact information such as names, addresses, phone numbers, and email addresses. Its structure makes it ideal for efficiently exchanging contact details across various applications and services, which is crucial for synchronizing contacts between devices or software.

Using vCard simplifies the process of importing and exporting contacts because it is widely supported by various email clients and mobile devices. This feature makes it a standard choice for managing personal and professional contact information across platforms.

Other formats like XML and JSON are general-purpose data interchange formats, which can be used for various types of data, but they do not provide the specialized structure needed for contact information management like vCard does. HTML, on the other hand, is primarily designed for displaying content on the web rather than storing or synchronizing contact data, further differentiating it from vCard's intended use.