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Encapsulation is one of the four fundamental principles of object-oriented programming (OOP). It refers to the practice of bundling or encapsulating an object's attributes (data) and methods (functions) together within a single unit referred to as a class. This approach allows for better organization, control, and protection of the object's attributes and methods by hiding the internal implementation and exposing only the necessary functionalities required by the user.

The benefits of encapsulation include: 1. Code modularity: Encapsulation helps in organizing the code more effectively by separating the data and their related operations into a single unit. 2. Data hiding: It hides the object's data from external access, which reduces the chances of unwanted alterations and ensures the integrity and consistency of the data. 3. Easier maintenance: With encapsulation, any changes to the object's data or methods can be done in one place without affecting the rest of the application. 4. Improved flexibility: Encapsulated classes can be easily reused and updated without impacting other parts of the code.

Let's consider an example of a bank account to demonstrate the concept of encapsulation. In Python, you can create a BankAccount class to encapsulate the data and methods associated with a bank account: ```python class BankAccount: def __init__(self, account_number, balance): self._account_number = account_number self._balance = balance def deposit(self, amount): self._balance += amount return self._balance def withdraw(self, amount): if amount <= self._balance: self._balance -= amount return self._balance else: return "Insufficient balance" def get_balance(self): return self._balance ``` In the example above, the BankAccount class has two attributes: `_account_number` and `_balance`. These attributes are marked as private (by using an underscore) to indicate that they should not be accessed directly from outside the class. The class also has three public methods: `deposit`, `withdraw`, and `get_balance`, which are used to perform operations on the bank account, such as depositing or withdrawing the money and checking the account balance. The encapsulation principle is being followed here as the internal details of managing the balance and account number are hidden from users, and only the necessary methods are exposed for users to interact with the object.