Open-source software is software with source code that is made freely available to anyone. Users can view, modify, and distribute the code under certain licenses. This model promotes collaboration and transparency, allowing developers to contribute to and improve the software collectively.
An example of open-source software is **Linux**, an operating system kernel used in various distributions such as Ubuntu, Fedora, and Debian. Linux is widely used in servers, desktops, and embedded systems, and its open-source nature has fostered a large community of contributors and users.