Free software is software that provides the users with the freedom to use, study, modify and redistribute it with or without modifications.
all, free software advocates, Linux users
Free software or software libre is software that guarantees the freedom to be used, studied, and modified without restriction, and the freedom to be copied and redistributed in modified or unmodified form either without restriction, or with minimal restrictions only to ensure that further recipients can also do these things and that manufacturers of consumer-facing hardware allow user modifications to their hardware. Free software in most cases is also available gratis (free of charge). However the focus of the term "free" is on freedom. R. Stallman summarised the difference in a slogan: "Think free as in free speech, not free beer."