---
title: "Define NSApplication and UIApplication"  
description: "Define NSApplication and UIApplication"  
author: "Tarun Kumar"  
published: 2015-10-29  
updated: 2020-09-18  
canonical: https://www.mindstick.com/interview/22875/define-nsapplication-and-uiapplication  
category: "iphone"  
tags: ["iphone", "ios", "objective c"]  
reading_time: 1 minute  

---

# Define NSApplication and UIApplication

**UIApplication** is the iOS singleton application base class, it provides a centralized point of control and coordination for apps running on iOS and every app have exactly one instance of UIApplication and NSApplication is the MacOS application base class.

## Answers

### Answer by Tarun Kumar

**UIApplication** is the iOS singleton application base class, it provides a centralized point of control and coordination for apps running on iOS and every app have exactly one instance of UIApplication and NSApplication is the MacOS application base class.


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Original Source: https://www.mindstick.com/interview/22875/define-nsapplication-and-uiapplication

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