# encapsulation

/ɛnkˌæpsuːlˈeɪʃən/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/encapsulation
Updated: 2026-07-22

## Definition

the act of hiding the inner details of how something works so you only see the simple outside part. In computer programming, it means keeping data safe inside a single unit or object.

For teachers: the bundling of data with the methods that operate on that data, restricting direct access to some of an object's components. This principle serves to hide internal state and prevent unintended interference from outside code.

## Examples

- Encapsulation makes the code easier to manage.
- By using encapsulation, the developer ensured that the internal variables of the user class could not be changed directly by other parts of the program.
- Effective encapsulation allows a library to update its internal logic without breaking the external applications that rely on its public interface.

## Usage notes

- Often used in the context of Object-Oriented Programming (OOP) alongside inheritance and polymorphism.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.