Promises

Asynchronous and synchronous are two different programming paradigms used to manage the flow of execution in computer programs.

Asynchronous JavaScript utilizes callbacks, promises, async/await, and the event loop to handle non-blocking operations, allowing for efficient execution of tasks without blocking the main thread.

JavaScript Concepts such as the 'this' keyword, prototypes, closures, async-style code, promises, and timers are fundamental for understanding JavaScript's behavior, enabling efficient and dynamic web development.