This is a booking system that allows theatres to store details of the shows they're currently running, customers' information such as their contact details and type of membership and ticket prices which can be stored, viewed, and changed whenever needed. Information is stored in a random access file which is a type of memory used to access data "directly" based on their record number.
Please refer to the Visual Basic documentation for more information about the language: https://docs.microsoft.com/en-us/dotnet/visual-basic/