Linux is software that does not cost money and is available for unrestricted modification.
Free and open-source software . That is , anyone is freely licensed to use , copy , study , and change the software in any way , and the source code is openly shared so that people are encouraged to voluntarily improve the design of the software . Linux . oggˈlɪnəks ] or , less frequently , [ ˈlaɪnəks ] ) is a Unix-like computer operating system assembled under the model of free and open-source software development and distribution .