IIFE stands for Immediately Invoked Function Expression. It is a JavaScript function that runs as soon as it is defined. The primary purpose of IIFE is to create a local scope for variables, protecting them from being accessed or modified outside the function.
Javascript is an asynchronous programming language. the main reason why its asynchronous because it is also single threaded.
you can use Webworkers to utilise more then one threads at a time.
In programming, the term asynchronous refers to code that doesn't block the main program flow while waiting for long-running operations to complete. This is in contrast to synchronous code, which executes line by line and waits for each operation to finish before moving on.
