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Linux originates from Unix and Unix was the
leading operating system in the 1970s, 80s and 90s.

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Linux fits in a movement that
was started by the Free Software Foundation.

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That's an organization that was created as early as
in the 1970s to make software available for free.

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And GNU is a part of the
Free Software foundation that provides free tools for

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Unix as well as open source licenses
to guarantee free access to application source code.

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In the 1980s already many free tools were
available. The only thing that was missing was

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a kernel. In 1991 Linus Storval posted a
message on Usenet and in that message he

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announced the development of an open source kernel
to be a part of the GNU project.

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From the beginning it was a joint initiative of people from all
over the world who are working together on the Linux kernel software.

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In 1992 the first version of the Linux
kernel was released and by combining the Linux

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kernel with other GNU tools, it was possible
to install Linux as an actual operating system.

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To make installation
easy, distributions are provided.

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Amongst the earliest distributions were yggdrasil and Slackware, but
currently they don't play an important role anymore. Red Hat

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and Ubuntu are amongst the most popular distributions now.
Linux is also the founder of git. While he was

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working on the Linux kernel, Linus Torvald had developed
a system to work together in a more efficient way.

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And the result is Git, which has become
the de facto standard for developing open source software.

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Millions of developers are working with Git on a daily
basis and behind current software projects. In Linux there often is

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a GIT project which makes it possible to download the
software for free and propose contributions to the software. And that

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means that the open source software behind Linux is
really open to anyone who wants to contribute to it.