A Linux User Group or Linux Users' Group (LUG) or GNU/Linux User Group (GLUG) is a private, generally non-profit or not-for-profit organization that provides support and/or education for Linux users, particularly for inexperienced users. The term commonly refers to local groups that meet in person, but is also used to refer to online support groups that may have members spread over a very wide area and that do not organize, or are not dependent on, physical meetings. Many LUGs encompass FreeBSD and other free-software / open source Unix-based operating systems.
Local Linux user groups meet (typically weekly to monthly) to provide support and/or arrange and host presentations for Linux users, particularly for inexperienced users. Given that Linux is not dominated by any specific corporate or institutional entity, LUG meetings typically encompass a broader range of topics than do the meetings of other user groups. Linux is predominantly user-supported, and some support is vastly easier via telephone or in person than over e-mail or USENET. LUGs are still primarily focused on hobbyist users and professionals who are engaged in self-directed study.
SVLUG is among the oldest and largest LUGs. It was originally formed as a Special Interest Group for the Silicon Valley Computer Society, founded by Daniel Kionka to support Xenix and "low-cost PC UNIX systems" (and later became focused on Linux, as the dominant free implementation of Unix).
According to the Linux User Group HOWTO:
Computer user groups are not new. In fact, they were central to the personal computer's history: Microcomputers arose in large part to satisfy demand for affordable, personal access to computing resources from electronics, ham radio, and other hobbyist user groups. Giants like IBM eventually discovered the PC to be a good and profitable thing, but initial impetus came from the grassroots.
To give just one indication of how LUGs differ from traditional user groups: Traditional groups must closely monitor what software users redistribute at meetings. While illegal copying of restricted proprietary software certainly occurred, it was officially discouraged—for good reason. At LUG meetings, however, that entire mindset simply does not apply: Far from being forbidden, unrestricted copying of Linux should be among a LUG's primary goals. In fact, there is anecdotal evidence of traditional user groups having difficulty adapting to Linux's ability to be lawfully copied at will.