Code is the set of instructions that tells a computer what to do. Software developers write code using programming languages such as JavaScript, Python, Java, or Go.
Everything a software application does, from displaying a button to processing a payment or saving data, is ultimately controlled by code.
Why it matters
Code is the foundation of software. It defines the application's behavior, rules, calculations, and interactions with other systems.
Good code should not only work, but also be understandable, maintainable, secure, and reliable. This becomes especially important as software grows and more people work on it.
How it works
Code is usually written in text files called code (or 'source code'). These files contain instructions written in a programming language.
For example:
if (user.isLoggedIn) {
showDashboard();
}
This code tells the program to show the dashboard if the user is logged in.
Depending on the programming language, the code may be interpreted directly or first converted into a form the computer can execute.
Code vs configuration
Code defines what the software can do. Configuration controls how that software behaves in a particular environment.
For example, the code might contain the logic for connecting to a database, while the configuration specifies which database to connect to.
Keeping these separate makes software easier to develop, test, and deploy.