What is the function of classes in the structure of the software type system?

Classes in a software type system serve as the fundamental building blocks for describing objects and their behavior. They define the data structure (fields) and methods for working with this data, providing encapsulation. Classes allow creating instances (objects) that have state and behavior defined by the class.

Additionally, classes support inheritance, enabling the creation of type hierarchies and code reuse. In a type system, classes act as user-defined data types, ensuring strict typing and program correctness control during compilation or execution.