Open-source software is computer software that is made available to the public with its source code. This means anyone can view, modify, and distribute the software freely. The collaborative nature of open-source projects allows developers from around the world to contribute, improving the software and fixing bugs more efficiently. Popular examples of open-source software include Linux, Apache, and Mozilla Firefox. One of the main advantages of open-source software is that it promotes transparency and security. Since the source code is accessible, users can inspect it for vulnerabilities and ensure that it meets their needs. Additionally, open-source software often has a strong community of users and developers who provide support and share knowledge, making it easier for newcomers to learn and adapt.