What is open source software?

Open source software is defined by its accessibility and modifiability. The key aspect of this type of software is that its source code is available for anyone to view, use, modify, and distribute. This means that developers can not only implement changes to the software but can also collaborate with others to improve it, adapt it for new uses, or fix bugs. The community-driven nature of open source encourages innovation and can lead to a diverse range of versions and enhancements, as multiple contributors worldwide can be involved in its development.

The other choices represent concepts that do not align with the principles of open source. Software that is free to use without any restrictions does not fully capture the essence of open source, as it may not necessarily allow modifications or redistribution. Software that cannot be shared or modified directly contradicts the defining characteristics of open source. Finally, paid software with exclusive features may offer a beneficial user experience, but it does not allow for the community collaboration that open source promotes. Therefore, the correct description of open source software is that its source code can be modified by anyone.