If you are learning programming, you will often hear the term source code.
But what exactly is source code?
Simply put, source code is the code written by a programmer to create a website, app, software, or other program. It is the human-readable version of a program.
A Simple Source Code Example
Let’s look at a very simple JavaScript example:
let name = "Masroor";
console.log("Hello " + name);
This is source code.
A programmer can read it and understand what it is supposed to do.
When this code runs, the result will be:
Hello Masroor
So, the source code contains the instructions that tell the computer what to do.
Why Is It Called Source Code?
It is called source code because it is the original code written by the developer.
Think of it like a recipe.
The recipe contains the instructions for making a dish. In the same way, source code contains the instructions for creating software.
The programmer writes the source code, and other tools process it so the computer can execute the instructions.
Source Code in a Website
Let’s take a simple HTML example:
<h1>Hello World</h1>
<p>Welcome to my website.</p>
This is also source code.
The browser reads the HTML and displays something like:
Hello World
Welcome to my website.
If you open a website and use View Page Source, you can often see the HTML source code sent to your browser.
However, what you see may not be exactly the original project source code. Modern websites can also use JavaScript bundles, generated files, frameworks, and other build tools.
Source Code vs Machine Code
These two terms are different.
- Source code is written by humans using programming languages such as Python, JavaScript, Java, or C++.
- Machine code consists of low-level instructions that a computer’s processor can execute.
Depending on the programming language, source code may be compiled, interpreted, or processed by a runtime before execution.
So the basic idea is:
Source Code → Processing → Executable Instructions → Result
Can Anyone Read Source Code?
If the source code is available, anyone with the right programming knowledge can read it.
For example, HTML, CSS, and much of the JavaScript delivered to a web browser can usually be viewed by users. But the original source code of applications and software is often kept private by developers or companies.
Why Is Source Code Important?
Source code is important because it is where a program is created and maintained.
Developers use source code to:
- Build software
- Create websites
- Fix bugs
- Add new features
- Change how a program works
- Maintain and improve applications
Without source code, making changes to a program can be much more difficult.
The Simple Idea to Remember
Don’t make source code complicated.
Source code is simply the human-readable code written by a programmer.
For example:
let total = 10 + 20;
console.log(total);
This is source code.
The computer processes these instructions and produces the result:
30
That’s the basic idea of source code.