What is the main characteristic of open-source software?

The main characteristic of open-source software is that its source code is available for modification and distribution. This fundamental trait allows users not only to access the underlying code but also to modify it to suit their specific needs, contribute to its improvement, or redistribute their versions of the software. Such openness fosters community collaboration, innovation, and rapid development cycles, which are hallmarks of many successful open-source projects.

Open-source software encourages transparency and allows for peer review, enhancing security and reliability compared to proprietary software, where the source code is hidden from users. This aspect of being open to modification is what distinguishes open-source software from others, making it appealing to developers, businesses, and individual users who value customization and community-driven projects.