What are coroutines? To know about coroutine, first you need to know about asynchronous programming, thread and multithreading concept. What is a thread? Thread describes in which context the function or sequence of instructions should be executed. So, every block of code or functions runs in a thread, right? Also, you can load multiple threads to perform different block of codes How to start a thread? Thread thread = new Thread(){ public void run(){ System.out.println("This is a thread"); } } thread.start(); So when coming to android, before learning about coroutines we need to discuss some scenarios. Normally how an app works when user launch an application. When user launchers the application, a main thread is created. This thread is intended to do small operations like button clicks, UI interaction , small mathematical operations. We cant perform long running operation like file download, database queries, network operations and image
If you are a beginner , then this blog will help you to dive into the basics.