The short answer.
A vCard QR code stores your contact details (name, phone, email, company, title, website and address) in the standard vCard format. When someone scans it, their phone offers to save you as a contact instantly. Fill in your details, download the QR, and add it to your visiting card, email signature or booth standee.
Why a vCard QR beats typing
No more misspelt emails or wrong numbers. One scan and your contact is saved with your name, company and role, which is perfect for events, sales visits, clinics, real estate site visits and shop counters.
Keep it scannable
The more fields you add, the denser the QR becomes. Include only what matters and print it at least 2.5 cm wide. Test the scan on both Android and iPhone.