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 Microtask And Macrotask in JavaScript (Finally Explained Simply) JavaScript looks simple, but sometimes its working becomes difficult to understand. You write some code, and the you see a output in an order you didn’t expect. This confuses many beginners and even experienced developers. The reason behind this is how JavaScript handles tasks in the background. JavaScript does not run everything at the same time. It decides what to run now and what to run later. This is where Microtasks and Macrotasks come in. What Microtasks and Macrotasks are? A Macrotask is a big task that JavaScript runs one by one. Example of microtask are setTimeout,setInterval,UI events,setImmediate  What is a Microtask? A Microtask is a small but very important task. Example of microtask are Promise.then, Promise.catch,Promise.finally and queue Microtask Important:All microtasks run before any macrotask Output  Step by step: Start-->runs immediately   Set timeout --> ...