An online guest book is a digital platform where visitors can leave messages, comments, or well-wishes for hosts, often used for events like weddings, anniversaries, or memorials. These guest books allow people to share their thoughts and memories in a convenient and accessible way, often featuring options for photos and videos. Many websites offer customizable templates for online guest books, making it easy for users to create a personalized experience. Guests can sign in from anywhere, and the entries are typically stored securely, allowing hosts to revisit the messages long after the event has ended.