For information on the company called UserLand, see UserLand Software.
Userland refers to an application space, typically in Unix or Unix-like operating systems which are external from the kernel. Sometimes userland can mean an application which performs its own system calls or input and output (IO), but typically the userland part of an application will request system calls and other system activities from the kernel.
In the filesystem hierarchical sense, userland means any storage space on the system disk which is not a part of the critical system storage, ie. it is meant for users' space storage such as their personal documents and other non critical data. In Unix systems this space can typically reside in the /home, /export/home, or /usr/home directories.
Radio Userland is a client-side weblog system incorporating an RSS aggregator, which was one of the first programs to both send and receive audio files as RSS enclosures (see podcasting).
UserLand was an early adopter of the RSS syndication method, merging Winer's Scripting News XML format with Netscape's original RSS.
UserLand is the owner of the open-source software Frontier, the kernel for both Radio, Manila and Dave Winer's OPML Editor, which uses the UserTalk scripting language.
Userland refers to an application space, typically in Unix or Unix-likeoperating systems, that is external to the kernel and is protected by privilege separation.
It can also refer to non-kernel system components such as a command shell or user utilities for manipulating filesystem objects that are collectively referred to as "the userland".
In the filesystem hierarchical sense, userland means storage space on the system disk that is not part of critical system storage, i.e., storage space used for storage of user files such as personal documents and other non-critical data.