What Is Rust? The Rise of Memory-Safe Languages
How Rust cuts security vulnerabilities through memory safety, and why it is spreading so quickly in systems software.
Aurora YazılımEditorial team
6 min read
Rust is an open-source systems programming language that runs as fast as C and C++ but guarantees memory safety at compile time. The core of the answer to “what is Rust” is its ownership model: without a garbage collector, it prevents bugs such as buffer overflows and use-after-free before the program ever runs. It is increasingly common in operating systems, browsers and server software.
What Is the Rust Programming Language?
The Rust programming language grew out of a project started at Mozilla, and its first stable release came out in 2015. Today it is developed by a broad community under the independent Rust Foundation. The place to go for official documentation and installation is rust-lang.org.
The language's goal is ambitious: to combine the speed and control of low-level languages with the safety of high-level ones. Traditionally you had to choose between these two properties; Rust aims to offer both.
Rust is used across a wide range, from command-line tools to network services, from embedded devices to WebAssembly modules running in the browser. It stands out especially where security and performance are critical at the same time.
Why Does Memory Safety Matter So Much?
In languages such as C and C++, memory management is largely the developer's job. Writing outside the bounds of an array, reusing freed memory or freeing the same memory twice can crash the program or let an attacker run code.
This problem is not theoretical. Microsoft and Google's Chromium team have publicly stated that roughly 70 percent of the serious security vulnerabilities in their products stem from memory safety issues. That is why many public agencies and large tech companies recommend choosing memory-safe languages for new projects.
Languages such as Java, C#, Go and Python largely solve this with a garbage collector. The price is extra overhead at runtime and occasional unpredictable pauses. Rust provides the same safety at compile time, without a garbage collector.
How Do Ownership and Borrowing Work?
Rust's safety rests on three core rules. They may feel unfamiliar at first, but once they sink in, they let you catch many bugs before the code even runs.
fn uzunluk(metin: &String) -> usize {
metin.len()
}
fn main() {
let selam = String::from("Merhaba");
let n = uzunluk(&selam); // lent out, we keep ownership
println!("{} karakter: {}", n, selam);
let tasindi = selam; // ownership moved
// println!("{}", selam); // compile error: selam is no longer valid
println!("{}", tasindi);
}Ownership
Every value has a single owner. When the owner goes out of scope, the memory is freed automatically. When a value is assigned to another variable, ownership moves too; the old variable can no longer be used.
Borrowing
To use a value without giving up ownership, you take a reference. At any one time there can be either multiple read-only references or a single mutable reference. This rule prevents concurrency bugs known as data races at compile time.
Lifetimes
The compiler verifies that the data a reference points to lives longer than the reference. This eliminates the class of bug known as a dangling pointer.
Rust vs. C++
Rust and C++ are used in similar areas and their performance is generally on the same level. The real difference is who is responsible for safety.
| Criterion | C++ | Rust |
|---|---|---|
| Memory safety | Depends on the developer's care | Checked by the compiler |
| Garbage collector | None | None |
| Performance | Very high | Very high |
| Concurrency bugs | Can appear at runtime | Data races are blocked at compile time |
| Package management | Multiple tools | Official tool: Cargo |
| Learning curve | Long and scattered | Steep at first, then consistent |
| Ecosystem age | Decades old | Younger, growing fast |
Where Is Rust Used?
We covered how to run Rust code in the browser in our what is WebAssembly article, and why low memory use and fast startup matter in our what is serverless article.
- Operating systems: The Linux kernel has begun accepting drivers written in Rust; Rust is also used in some Windows components.
- Browsers: Several Firefox components are written in Rust.
- Network and server software: high-traffic services, proxy servers and CDN infrastructure.
- Command-line tools: fast search, file and package management tools.
- WebAssembly: modules that run in the browser at near-native speed.
- Embedded systems: secure software on resource-constrained devices.
- Cloud and serverless: functions that need fast startup times and low memory use.
Installing Rust and Your First Project
Rust's official installer is rustup; it installs the compiler, the Cargo package manager and the standard library together and keeps you on the current stable release.
rustc --version
cargo --version
cargo new merhaba
cd merhaba
cargo runmacOS and Linux
Run the command below in a terminal and follow the prompts. After installation, close and reopen the terminal.
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | shWindows
Download and run rustup-init.exe from the install page on rust-lang.org. If needed, the installer asks you to install the Visual Studio C++ build tools; without them the linking step fails.
Should You Learn Rust?
Rust's most talked-about challenge is its learning curve. The compiler enforces strict rules, and in the first few weeks you will run into error messages often. The good news is that these messages are descriptive and often suggest the fix directly.
If you want to work in systems programming, performance-critical services, embedded software or security, Rust is a strong investment. If you want to build websites or business applications, starting with a language like JavaScript, PHP or Python gives faster results; you can add Rust later for the performance-critical parts.
While learning, instead of fighting the compiler, think of it as a tutor. Every error message points out in advance a problem you might hit later in production. The community forums and official documentation are also very welcoming to beginners.
- The official book: The Rust Programming Language, free and online.
- Rust by Example: short, runnable examples.
- Write a small CLI tool: a simple program that reads files and processes text is the best exercise.
The Future of Memory-Safe Languages
Secure programming languages are no longer just a developer preference but are seen as part of security policy. Choosing a memory-safe language for newly written critical components prevents a significant share of future vulnerabilities from the start.
This does not mean all C and C++ code will be rewritten. The more realistic picture is that new components are written in safe languages and work alongside existing systems. Rust's ability to interface easily with C is what makes this transition possible.
For businesses, the message is this: what matters is less which language the software you use is written in than how security is built into the development process. At Aurora Yazılım, we choose the language for our industry software solutions and e-commerce infrastructure projects according to need, and plan security and performance from the start. We explain how speed is measured and improved on the web side on our speed and performance management page.
Frequently Asked Questions
01Is Rust used in web development?
Yes, there are web frameworks and API services written in Rust on the server side. However, the ecosystem is not as broad as JavaScript, PHP or Python. Rust is usually chosen for services that need high performance or for WebAssembly modules.
02Will Rust replace C++?
Not in the short term; there is a huge codebase written in C++ and the language continues to evolve. But in new projects, especially where security is critical, Rust is chosen more and more often.
03What does unsafe mean in Rust?
Unsafe is a keyword that turns off some of the compiler's checks for a specific block of code. It is needed for things like accessing hardware or interfacing with C libraries. In well-written projects, these blocks are kept small and reviewed carefully.
Rust brings speed and safety together and is setting a new standard in systems software; it stops most memory-related vulnerabilities before the code even runs. For software with security and performance designed in from the start, explore our software solutions, take a look at our web design service for your web project, or get in touch with us.
