What is encapsulation?

Encapsulation is a fundamental concept in object-oriented programming (OOP) that involves bundling the data (attributes) and methods (functions) that operate on that data into a single unit, typically a class. Here are the key aspects of encapsulation:

1. Data Hiding: Encapsulation restricts direct access to some of an object's components, which is achieved by using access modifiers (like private, protected, and public). This helps protect the integrity of the data by preventing unauthorized access and modification.

2. Public Methods: Instead of accessing the object's data directly, encapsulation provides public methods (often called getters and setters) to interact with the data. For example:

   public class Employee {
       private double salary;
   
       public double getSalary() {
           return salary;
       }
   
       public void setSalary(double salary) {
           this.salary = salary;
       }
   }

3. Improved Maintainability: By controlling access to the internal state of an object, encapsulation makes it easier to change the implementation without affecting other parts of the program. This leads to better maintainability and flexibility.

4. Increased Security: Encapsulation helps in securing the data by exposing only necessary parts of the object and hiding the internal workings, reducing the risk of unintended interference.

In summary, encapsulation is about creating a protective barrier around the data and methods of a class, promoting data integrity, security, and maintainability in software design.