What is Rust?

Every app, game, and website you use is built from code — step-by-step instructions a computer follows. Rust is one of the languages we write those instructions in, and it’s known for being both fast and remarkably safe.

Engineers use Rust to build serious software: game engines, web servers, command-line tools, and even pieces of operating systems and phones. In this course, you’ll learn it from the ground up.

The Big Idea A programming language is how we tell a computer exactly what to do — step by step, like a precise recipe. Rust is one of those languages, and it's famous for being fast and safe at the same time.

Why people choose Rust

Most languages force a trade-off: be fast OR be safe. Rust’s whole goal is to give you both. 🦀

🏎️ Fast — Rust programs run about as quickly as code gets.
🛡️ Safe — Rust catches whole categories of bugs before your program ever runs.
🧰 Helpful — when something is wrong, Rust’s error messages explain it clearly.

Think of it like this… Imagine a race track with high-grip guardrails. You can go full speed (that's performance), and the rails keep you from crashing off the edge (that's safety). Rust gives you both at once.

Meet your guide: Ferris 🦀

Ferris the crab is Rust’s friendly mascot, and your guide for this course. Ferris will pop in with tips, shortcuts, and the occasional warning.

Ferris says: You don't have to understand everything on the first pass. Programming is a skill you build up over time — a little each lesson, and it adds up fast.

What does Rust code look like?

Here’s a tiny Rust program. Don’t worry about every detail yet — press the green ▶ Run button and see what it does.

fn main() {
    println!("Hi! I'm Ferris the crab. 🦀");
    println!("Welcome to Rust for Students!");
}

Those lines appeared because the computer followed your instructions exactly. The println! part means “print a line” — it displays text on the screen.

Try this! Click inside the code box and change the words inside the quotes to your own message. Press ▶ Run to see it, then press ↺ Reset to bring back the original.

Quick quiz

What is Rust?

You learned… Rust is a programming language that is both fast and safe, Ferris is your guide, and println! prints text to the screen. Next up: setting up Rust on your computer! 🛠️