Which detail is common to both user/traveler profiles and user profiles?

The detail that is common to both user/traveler profiles and user profiles is the email address. Email addresses serve as a primary means of communication and identification for users across various platforms. In user profiles, the email address may be used for account verification, recovery, and notifications. Similarly, for traveler profiles, the email address often serves as a point of contact for itineraries, booking confirmations, and customer support.

While home addresses, phone numbers, and job titles might be important for certain aspects of both profile types, they do not necessarily have the universal applicability and importance that an email address does. The email address acts as a central and often mandatory piece of information that facilitates interactions in both personal and travel-related contexts.