An "E-Ticket" is a digital version of a traditional ticket, often used for travel, events, or attractions. Instead of a physical ticket, customers receive a confirmation via email or a mobile app, which they can present at the entrance or boarding gate. This system simplifies the ticketing process and reduces the risk of losing a physical ticket. E-Tickets are commonly used by airlines, such as Delta Air Lines and American Airlines, as well as for events like concerts and theme parks, including Disneyland. They enhance convenience and efficiency, allowing for quick check-ins and easy access to purchased services.