The Core Idea: Code You Can See
Every piece of software you use — a word processor, a weather app, a browser — runs on source code: the instructions a developer writes that tell the program what to do. In most commercial software, that code is proprietary, meaning the company keeps it locked away. You use the finished product but have no way to examine what's happening underneath.
Open source software flips that model. The code is published publicly, usually on a platform like GitHub, so that any developer, researcher, or curious individual can read it, propose improvements, or adapt it for new purposes. This openness isn't just a philosophical stance — it has real, practical consequences for how the software behaves and how reliably it serves users over time.
It's worth pairing this understanding with a look at how software licenses work, since the type of license attached to open source code shapes exactly what anyone — including developers — is legally allowed to do with it.
Why Transparency Has Real Privacy and Security Benefits
When source code is visible to the public, security researchers can audit it for flaws, backdoors, or data-collection practices that the original developer may not have disclosed. With proprietary software, users must trust the company's word about what the application does with their data. With open source, that trust can be verified.
This doesn't mean open source software is automatically secure. A project that's poorly maintained, or one where few developers actively review the code, can still harbor serious vulnerabilities. The transparency advantage is only realized when a healthy, active community is actually looking. Well-resourced projects — particularly those backed by major foundations or widely adopted by enterprises — tend to receive the scrutiny that makes the security benefit real.
90%+
Enterprise applications using open source components
According to Synopsys's annual Open Source Security and Risk Analysis report, the vast majority of commercial codebases contain open source components.
~17,000
Contributors to the Linux kernel
The Linux Foundation reports that the Linux kernel project has drawn contributions from thousands of developers across hundreds of organizations worldwide.
78%
Organizations that increased open source use
A Red Hat survey of enterprise IT leaders found a strong majority reported expanding their reliance on open source software over a recent two-year period.
For users concerned about privacy, open source tools also allow independent researchers to confirm whether an app collects user data or communicates with external servers in ways that aren't disclosed. That kind of accountability is structurally impossible with closed, proprietary code. You can learn more about related online safety topics in the Internet & Privacy hub.
What It Means for Updates, Longevity, and Control
Proprietary software lives or dies by its developer's business decisions. If a company shuts down or stops supporting a product, users are often stuck — the app stops receiving security patches, or simply stops working. Open source software can outlive any single company because anyone with sufficient skill can fork the project (create their own copy and continue developing it).
This has practical implications for keeping software updated and secure. Active open source projects frequently release patches faster than proprietary vendors because the contributor base is broader and not constrained by internal release schedules or business priorities.
Check Project Health Before You Commit
Before using an open source tool for anything important, spend two minutes checking its repository. Look for recent commits (code changes), an active issue tracker, and more than one regular contributor. A project with its last update several years ago may carry security risks that no one is actively addressing.
That said, community-driven development isn't a guarantee of stability. Smaller open source projects with only one or two maintainers can go dormant, leaving users with software that eventually breaks or exposes security gaps. Before relying on any open source tool for important tasks, it's worth checking how recently the project was updated and how large its contributor community is.
Open Source in Everyday Life — You're Already Using It
Open source software is far more prevalent in daily life than most people realize. The Android operating system on millions of smartphones is built on an open source Linux kernel. The Firefox browser is open source. LibreOffice offers a full productivity suite with open code. VLC media player, widely used for video playback, is open source. A large portion of the internet runs on open source web servers, databases, and programming frameworks.
Whether you choose open source tools deliberately or use them without thinking about it, understanding what the label means helps you make more informed decisions — about privacy, about long-term reliability, and about what kind of software ecosystem you want to support. For a related angle on choosing between software formats, see browser-based vs. desktop apps.
Frequently Asked Questions
Not necessarily. 'Open source' refers to code availability, not price. Many open source programs are free to download and use, but some are sold commercially or require payment for support and premium features. The license terms determine what you can do with the software.
It can be, because anyone can inspect the code for security flaws — a practice called peer review. However, security depends heavily on how actively the project is maintained and how quickly vulnerabilities are patched. An abandoned open source project may carry more risk than a well-maintained proprietary one.
Yes. Many businesses build services, support contracts, cloud hosting, or premium add-ons around open source projects. Red Hat, for example, built a multi-billion-dollar business providing enterprise support for Linux-based systems.
Freeware is software offered at no cost, but its source code remains private — you can't inspect or modify it. Open source software makes the code publicly available regardless of whether it costs money.
Look for active development (recent commits or releases), a large contributor base, and well-known organizations or foundations backing the project. Projects hosted on platforms like GitHub include a public history of changes, which adds accountability.
No. Most users never read a line of source code and still benefit from better security, faster bug fixes, and more community-driven features. The transparency benefits the ecosystem even if individual users never engage with the code directly.
The content on this site is provided for informational purposes only and should not be considered a substitute for professional advice. While we strive to provide accurate and up-to-date information, we make no guarantees regarding its completeness or accuracy. Always consult a qualified professional for advice specific to your circumstances before making any decisions.