JavaScript is single-threaded but it can still take advantage of asynchronous
programming.

The Event Loop is a Javascript construct responsible
for holding operations to be executed asynchronously with respect to the main
flow of execution. Whenever we meet a portion of code that may not be 
possible to execute now, it is put in the Event Loop. Let's look at some
examples:

1. 

```javascript
  setTimeout(() => console.log('test'), 1000);
```
`console.log('test')` will be put in the Event Loop.

2. 
```javascript
  
  const promise = new Promise(function (resolve, reject) {
  console.log('test');
  resolve();
}).then(() => {
  console.log('test2');
});

```
console.log('test2') will be put in the Event Loop.