How encapsulation works for the program and the data it processed?

Encapsulation is a fundamental principle of object-oriented programming that involves bundling the data (attributes) and the methods (functions) that operate on that data into a single unit, or class. This approach restricts direct access to some of the object's components, allowing for controlled interaction through public methods, which help maintain data integrity and security. By hiding the internal state and requiring all interactions to occur through well-defined interfaces, encapsulation promotes modularity and reduces the complexity of program maintenance and evolution. Ultimately, it ensures that objects manage their own state and behavior, leading to more robust and maintainable code.