BookCrossing is a global community of book lovers who share and track books as they travel from reader to reader. Participants register their books online, label them with a unique identification number, and then leave them in public places for others to find. This process encourages reading and promotes a sense of community among book enthusiasts. Once a book is found, the new reader can log its journey on the BookCrossing website, sharing their thoughts and experiences. This creates a unique tracking system, allowing participants to see where their books have traveled and how many readers have enjoyed them.