# Kotlin Coroutines and Flow (Android)

> Asynchronous programming with Coroutines: launch, async, suspend functions, Dispatchers, Flow, StateFlow, SharedFlow

- 20 interview questions
- Mid-Level
- [Interview Questions: Android](https://sharpskill.dev/en/technologies/android/interview-questions.md)

## 1. What is a coroutine in Kotlin?

**Answer**

A coroutine is a lightweight thread that allows writing asynchronous code sequentially. It can be suspended without blocking the thread, allowing other tasks to execute. More efficient than traditional threads.

## 2. What is the difference between launch and async?

**Answer**

launch starts a coroutine that doesn't return a result (returns a Job). async starts a coroutine that returns a result via a Deferred (await()). Use async when you need the result.

## 3. What is the suspend keyword used for?

**Answer**

suspend marks a function that can be suspended and resumed later without blocking the thread. These functions can only be called from other suspend functions or coroutines. They enable asynchronous operations.

## 17 more questions available

- What is a Dispatcher in coroutines?
- When to use Dispatchers.IO?

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