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+# Hello, JavaScript!
+
+The programs in JavaScript are called *scripts*. They can be embedded right into HTML using `<script>` tag and run automatically as the page loads.
+
+For example, this HTML-page shows the "Hello" message:
+
+```html run
+<!doctype html>
+<script>
+  alert("Hello!");
+</script>
+```
+
+JavaScript can execute not only in a browser, but also on a server, or actually on any device that has a special program called [the JavaScript engine](https://en.wikipedia.org/wiki/JavaScript_engine). 
+
+Browsers have built-in JavaScript engines, so they can run scripts.
+
+We can also run scripts using [Node.js](https://nodejs.org), it's commonly used to build server-side applications.
+
+Depending on the environment, JavaScript may provide platform-specific functionality.
+
+- In a web browser, JavaScript can manipulate the web-page, send network requests, show messages and so on.
+- Node.js allows to run a web-server.
+
+...And so on. Even a coffee machine may include its own JavaScript engine, that could allow us to program its recipes.
+
+![](javascript-engine.svg)
+
+In this tutorial we concentrate on the "core JavaScript", that's the same everywhere.**
+
+After you learn it, you can go in any direction: learn browser functionality, how to write servers and so on.
+
+Please turn the page to start learning JavaScript!