A Digital Guest Book is an online tool that allows guests to leave messages, comments, or signatures during events such as weddings, parties, or memorials. Unlike traditional guest books, which require physical signatures, digital versions can be accessed from any device, making it easy for guests to participate from anywhere. These guest books often include features like photo uploads, customizable templates, and social media sharing options. They provide a modern way to collect memories and sentiments, allowing hosts to preserve and revisit the messages long after the event has ended.