UNDERSTANDING THE MAIN THREAD IN THE BROWSER

Summary from the TLDR Web Dev newsletter

The main thread in a browser is responsible for executing JavaScript, handling user interactions, updating the DOM, and managing the event loop, all in a single-threaded environment. JavaScript's single-threaded nature, combined with the event loop, allows it to handle asynchronous tasks efficiently using task and microtask queues without blocking the thread. Optimizing main thread usage is critical for creating responsive and smooth web apps, especially by minimizing blocking operations and using tools like web workers.