# Immutable Object

An object whose data cannot change after it is created.

## What is **Immutable Object**?

An **immutable object** cannot change after it is created. To "change" it, you make a new object with the new values. Strings in C#, Java and Python work this way.

```csharp
public record Point(int X, int Y);

var a = new Point(1, 2);
var b = a with { X = 5 }; // a is unchanged; b is a new Point(5, 2)
```

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Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/immutable-object