The Day of Union is a platform for creating online wedding invitations that helps couples design and share electronic wedding invitations quickly, beautifully, and conveniently. Without needing design or programming skills, brides and grooms can choose invitation templates, customize wedding information, and create a dedicated wedding invitation page to send to guests.

The Day of Union addresses the challenges of designing, printing, and sending traditional wedding invitations, especially when invitations need to be sent to friends, colleagues, or guests who are far away. Invitations can be shared directly through Facebook, Messenger, Zalo, or sent via a link, making it easy for guests to view wedding information on their phones.

Main features include: creating and customizing online wedding invitations, choosing from many interface templates that match each couple's style, RSVP (registration of attendance) to manage the guest list, sending well wishes and preserving memories, while also supporting online wedding gifts and providing important information such as time, location, maps, and the wedding day's schedule.

The unique aspect of The Day of Union is its focus on the online wedding invitation experience specifically for the Vietnamese market, combining invitation design, wedding information pages, guest management, RSVP, and memory preservation all in one platform. The product is optimized for mobile devices, allowing brides and grooms to easily create and share invitations without needing to install specialized software.