Java vs. JavaScript

A very common misconception for beginners is that Java and JavaScript are the same language, or at least closely related. A helpful analogy to remember the difference is:

Java is to JavaScript as car is to carpet.

They are entirely distinct languages, often used for entirely different purposes.

Java

Java is a statically-typed, object-oriented language that compiles down to byte code and runs on the Java Virtual Machine (JVM). It is heavily utilized for robust server-side applications, native Android mobile applications, and large-scale enterprise systems.

JavaScript

JavaScript is a dynamically and weakly-typed language. It was initially designed specifically to run natively inside web browsers. Today, thanks to runtimes like Node.js, Deno, and Bun, it can also run outside the browser on servers.

A Brief History

If they are so different, why do they share a name?

When Brendan Eich created JavaScript in the mid-1990s (famously coding the initial prototype in just 10 days), Java was an incredibly popular and highly marketed programming language. To capitalize on Java’s momentum and marketing value, the creators named this new browser-based language “JavaScript.” Despite the branding synergy, the architecture and execution models of the two languages remained distinct.