Enums
As discussed earlier, enums increase the level of abstraction in your application and allow the developer to focus on the meaning of the values rather than being concerned with how the values are stored in memory. This is because an enum type allows you to label specific integer numeric values with meaningful or easy to remember names.
Case study: the Metro line
Business problem: You work with an engineering team tasked with writing an application that keeps track of commuter trains along the Metro. One of the key business requirements is the ability to easily identify which station a train is currently located at or en route to. Each train station has a unique name, but the database tracks the stations by their ID values, such as 1100, 1200, ...
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