What is open source software in simple terms?

What is open source software in simple terms?

Understanding what is open source software in simple terms reveals the massive technology powering your daily devices without you realizing it. This model serves as the foundation for the worlds most powerful computers and common mobile systems. Explore how this open code impacts your digital tools to improve your overall technical knowledge.

What exactly is open source software?

Open source software is computer software where the original source code is made freely available and may be redistributed and modified by anyone. Think of it as a community-driven project rather than a locked-down product - but theres a surprising fact about the worlds 500 most powerful supercomputers that reveals just how dominant this model has become. Ill share that specific secret in the section on real-world usage below.

To understand it simply, imagine you go to a restaurant and love the secret sauce. In a proprietary world, the chef keeps the recipe in a locked safe. You can eat the sauce, but youll never know if it contains ingredients youre allergic to, and you certainly cant make it at home. In the open source world, the chef hands you the recipe along with the meal. You can study it, share it with friends, and even suggest adding a bit more garlic to make it better for everyone.

Source Code: The recipe behind the screen

Source code is the set of instructions that programmers write to tell a computer what to do. Most of us only see the finished product - the app on our phone or the browser on our desktop. Lets be honest, the term source code sounds like something out of a 90s hacker movie, but its just text. When software is open source, that text is public. Anyone with the skill can look at it to understand how the software handles their data or why it keeps crashing.

When I first started looking at source code, I felt like I was trying to read ancient hieroglyphics. My heart was racing as I opened a GitHub repository, expecting to see some magical wisdom. Instead, I saw thousands of lines of code that made no sense at first. It took me months of staring at a glowing screen until my eyes burned to realize that code isnt magic - its just a conversation between humans and machines. Having that conversation out in the open makes the software better for everyone.

Why is open source software so popular?

Open source has moved from a niche hobby to the backbone of the modern internet. Around 96% of businesses globally now run some part of their operations on open source software,^[1] a massive shift from two decades ago when proprietary systems were the only choice for serious work. This popularity isnt just about saving money on license fees; its about speed and flexibility.

It just works. Because thousands of developers can see the code, bugs are often found and fixed much faster than in a closed company environment. If a company goes out of business, their proprietary software might die with them. With open source, the community can keep the project alive indefinitely. This transparency creates a level of trust that a black box program simply cannot match.

Is it actually more secure?

A common worry for beginners is that making code public makes it easier for hackers to find holes. However, the opposite is usually true. This is often called Linuss Law: given enough eyeballs, all bugs are shallow. When code is public, security experts from all over the world can audit it. In a closed system, you are essentially trusting that the companys small team of developers didnt miss anything. Statistics show that 89% of IT leaders now believe enterprise open source is as secure as, or even more secure than, proprietary software. ^[2]

The 'Free' Myth: Does it cost money?

There is a famous saying in the community: think of open source as free as in speech, not free as in beer. While you can often download and use the software without paying a cent, the freedom refers to your right to use and change the code. Many people assume developers work for free out of the goodness of their hearts. While some do, many are paid by large corporations to maintain these tools because those corporations rely on them.

Ill be honest, I used to think open source was just for people who couldnt afford real software. I was dead wrong. Today, companies make billions by providing support, cloud hosting, and specialized features on top of free code. You might pay for the convenience of having someone else manage the software for you, but you always have the freedom to take the code and run it yourself if you want to.

Where do you see it in real life?

You are likely using open source software right now without realizing it. Android, the operating system used on about 73% of the worlds smartphones, is based on open source code. ^[3] If youve ever used the Firefox browser, WordPress to build a website, or VLC to play a movie, youve used open source. But here is the kicker I mentioned earlier: 100% of the worlds top 500 supercomputers now run on Linux, which is an open source operating system. Every single one.

Beyond supercomputers, the infrastructure of the web depends on it. Modern data indicates that 91.3% of the top 1 million web servers run on Linux. ^[5] Whether you are checking your bank balance or scrolling through social media, you are moving through a digital world built on open foundations. Its not just an alternative - its the standard.

Open Source vs. Proprietary Software

Open Source (e.g., Linux, WordPress)

- Usually $0 to download; costs come from hosting or professional support

- Full access to source code; anyone can audit for security or privacy

- Community forums, documentation, and third-party consultants

- Unlimited; you can change anything if you have the coding skills

Proprietary (e.g., Windows, Adobe)

- Varies; usually involves a one-time license fee or monthly subscription

- Closed; only the owner company knows exactly how the code works

- Dedicated customer service, help desks, and official training

- Limited to the settings and features the company provides

Liam's Small Business Shift: From Licensing Fees to Freedom

Liam, a freelance graphic designer in London, was struggling with rising monthly subscription costs for his design and office software. He felt trapped by the $60 USD per month fees that seemed to increase every year without adding any features he actually used.

He tried switching to open source alternatives like GIMP and LibreOffice. His first attempt was frustrating - the menus were different, and he couldn't find his favorite keyboard shortcuts. He almost gave up after a client's file didn't open correctly, fearing he'd look unprofessional.

Instead of quitting, Liam joined an online community and realized he just needed to install a few 'compatibility plugins.' He spent a weekend customizing the interface to look like his old software. The breakthrough came when he realized he could actually make the tools faster by removing features he didn't need.

By the end of the year, Liam had saved over $700 USD in licensing fees. He reported that his workflow was 20% faster because his 'lean' software didn't lag, and he even started contributing small bug reports back to the community that helped him.