The methods in the Selector classes encapsulate common SOQL queries made by the application, such as selectById, as well as more business-related methods, such as selectDriversByTeam. This helps the developers who consume the Selector classes identify the correct methods to use for the business requirement and avoids replication of SOQL queries throughout the application.

Each method also has some standard characteristics in terms of the SObject fields populated, regardless of the method called and the security checks implemented. The overall aim is to allow the caller to focus on the record data returned and not how it was read from the database.