This ER diagram for bus reservation represents the model of the bus ticket booking system entity. The entity-relationship diagram of the bus ticket booking system shows all the visual instruments of database tables and the relations between Booking, bus route, bus, set, etc. ER diagram for bus reservation used structure data to define the relationships between structured data groups of bus ticketing booking system functionalities. The main entities of the bus ticket booking system are bus, Booking, customer, bus route, ticket booking, and seat. This diagram implements indexing on each bus ticket booking system table for fast query execution.