Lesson 01
What JavaScript is
A computer is fast but completely literal. Code is how we tell it what to do — and JavaScript is the language that makes web pages actually do things.
PLAINA computer only does what it's explicitly told, one step at a time. Those written instructions are code, written in a programming language. JavaScript is one of the most common ones, and its specialty is making web pages interactive — a button that responds, a form that submits, content that updates without a reload. It runs inside your web browser.
A LEVEL DEEPERThat same language now also runs outside the browser (on servers and more), but “the thing that makes web pages do stuff” is the right mental picture to hold. Everything else in this course is built on top of JavaScript.