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# NSNull

A singleton object used to represent null values in collection objects that don’t allow `nil` values.

```
class NSNull
```

## Overview

[`NSNull`](/documentation/Foundation/NSNull) is “toll-free bridged” with its Core Foundation counterpart, <doc://com.apple.documentation/documentation/CoreFoundation/CFNull>. See [Toll-Free Bridging](https://developer.apple.com/library/archive/documentation/General/Conceptual/CocoaEncyclopedia/Toll-FreeBridgin/Toll-FreeBridgin.html#//apple_ref/doc/uid/TP40010810-CH2) for more information on toll-free bridging.

## Topics

### Obtaining an instance

[`null`](/documentation/Foundation/NSNull/null)

Returns the singleton instance of `NSNull`.


---

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