After emerging over the last few years, Linux has become a commonly used program. It is especially successful in the financial field, where the need for extremely quick servers is huge.
It's origin lies in an open source, enabling it to be utilized and edited by its users. Because of this, people have been allowed to adapt it to their own needs, thus not having to rely on others to improve their ease of work.
This, in turn, has created unintended improvements to the system itself, and helped connected parties as well.