Which operating system is known for being open-source?

The correct answer, Linux, is known for being an open-source operating system, which means that its source code is freely available for anyone to view, modify, and distribute. This characteristic allows users and developers to customize the operating system to meet their specific needs and enhances collaboration within the community. The open-source model encourages innovation and the sharing of improvements, contributing to the rapid development of various distributions or "distros" of Linux, such as Ubuntu, Fedora, and CentOS, each tailored for different purposes.

The community-driven approach of Linux fosters a broad support network, providing users with access to a wealth of documentation and forums where they can seek help or share solutions. This flexibility and transparency contrast with proprietary operating systems, which restrict access to their source code and often require licensing fees. Linux's open-source nature has made it particularly popular among developers, system administrators, and organizations that prioritize customization, security, and cost-effectiveness.