Desktop environment in the context of "Desktop metaphor"

A graphical user interface, or GUI, is a form of user interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation. In many applications, GUIs are used instead of text-based UIs, which are based on typed command labels or text navigation. GUIs were introduced in reaction to the perceived steep learning curve of command-line interfaces (CLIs), which require commands to be typed on a computer keyboard.

The actions in a GUI are usually performed through direct manipulation of the graphical elements. Beyond computers, GUIs are used in many handheld mobile devices such as MP3 players, portable media players, gaming devices, smartphones and smaller household, office and industrial controls. The term GUI tends not to be applied to other lower-display resolution types of interfaces, such as video games (where head-up displays (HUDs) are preferred), or not including flat screens like volumetric displays because the term is restricted to the scope of 2D display screens able to describe generic information, in the tradition of the computer science research at the Xerox Palo Alto Research Center.

Free and open-source software (FOSS) is software available under a license that gives users the right to use, share, modify, and distribute the software – modified or not – to everyone and provides the means to exercise those rights using the software's source code. FOSS is an inclusive umbrella term encompassing free software and open-source software. The rights guaranteed by FOSS originate from the "Four Essential Freedoms" of The Free Software Definition and the criteria of The Open Source Definition. All FOSS can have publicly available source code, but not all source-available software is FOSS. FOSS is the opposite of proprietary software, which is licensed restrictively or has undisclosed source code.

The historical precursor to FOSS was the hobbyist and academic public domain software ecosystem of the 1960s to 1980s. Free and open-source operating systems such as Linux distributions and descendants of BSD are widely used, powering millions of servers, desktops, smartphones, and other devices. Free-software licenses and open-source licenses have been adopted by many software packages. Reasons for using FOSS include decreased software costs, increased security against malware, stability, privacy, opportunities for educational usage, and giving users more control over their own hardware.

Xfce (pronounced as four individual letters, /ɛks ɛf siː iː/) is a free and open-source desktop environment for Linux and other Unix-like operating systems.

Xfce aims to be fast and lightweight while still visually appealing and easy to use. The desktop environment is designed to embody the traditional Unix philosophy of modularity and re-usability, as well as adherence to standards; specifically, those defined at freedesktop.org.

Windows 10 is a major release of Microsoft's Windows NT operating system. The successor to Windows 8.1, it was released to manufacturing on July 15, 2015, to retail on July 29, 2015, and was a free upgrade to users of Windows 7, 8, and 8.1. Its server counterparts are Windows Server 2016, 2019, and 2022. It was succeeded by Windows 11 in October 2021.

In contrast to the tablet-oriented approach of its predecessor, Windows 10 returned to a desktop-oriented interface in line with previous versions of Windows and reintroduced the Start menu. Other features included the Cortana virtual assistant, Task View and virtual desktops, Action Center, biometric authentication through Windows Hello, an improved Settings component, Xbox Live integration, and DirectX 12. Also, Microsoft Edge was introduced, deprecating Internet Explorer. Unlike previous NT releases, Windows 10 received free feature updates on an ongoing basis. Alternatively, enterprise environments can use long-term support milestones that receive only critical and security updates. An ARM version of Windows 10 was released in 2018.

In computing, a daemon is a program that runs as a background process, rather than being under the direct control of an interactive user. Customary convention is to name a daemon process with the letter d as a suffix to indicate that it's a daemon. For example, syslogd is a daemon that implements system logging facility, and sshd is a daemon that serves incoming SSH connections.

Even though the concept can apply to many computing systems, the term daemon is used almost exclusively in the context of Unix-based systems. In other contexts, different terms are used for the same concept.