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Websites started out as simple, non-interactive documents. You could read them, you could click links to other pages, and you could fill in forms on them. That was about it.

JavaScript changed all that: it enabled websites to become properly interactive, almost like using an app.

JavaScript is used on websites to:

• Load more content and fetch data from external services

• Create interactions and animations

• Provide custom functionality that the browser doesn’t offer

Some JavaScript can be very simple, like the search box on the front of this website. But it can also be used to make incredibly complex applications like Google Docs or Google Maps.