This is an entry in our Disneyland 101 Glossary: Disneyland Resort definitions in under 101 words, from Mouse Brief.
Park Reservations were put in place in 2021. At the time of this writing, ticket holders and Magic Key passholders must make a reservation at the park where they wish to start the day. Those withPark Hoppers (or Magic Keys) are free to switch parks after 11:00am without a further reservation. The number of park reservations available is dependent on the ticket type being used, and reservations do run-out. Opting for a different ticket type (for example, adding Park Hopper) MAY open-up availability. Guests are not able to use tickets or passes without a corresponding reservation.
Thanks for reading this entry in our Disneyland 101 Glossary. For instructions for making park reservations, see Guide to Park Reservations for Disneyland & Why You Need Them. For assistance planing your Disneyland visit, see our free and complete Step-by-Step Disneyland Prep
For more on ticket types, find our guide here: