A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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For questions pertaining to Android, the Linux-based touch-enabled operating system designed for mobile devices.
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For questions pertaining to compiling C programs on the Raspberry Pi.
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the software that manages the hardware and software resources of the Raspberry Pi and provides common services for the applications.
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The Graphical User Interface, or GUI, allows the user to interact with images rather than text.
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non-compiled programs written in scripting languages (e.g. perl, python or tcl) or command line interpreters such as Unix shell.
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For questions pertaining to the `bash` shell command processor.
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for questions related to how to use control electronics from the Raspberry Pi, and how to control the Raspberry Pi from electronics.
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Unchanging address permanently assigned to a device in an IP network.
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a device that records video and then uploads that video to a computer.
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For questions regarding how to update the Pi's operating systems, programming languages, and applications (both native and external). Consider also tagging with the program or OS that you are updating…
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covers everything related to setting up the Raspberry Pi including flashing SD cards and changing the default user.
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a library for accessing GPIO pins as well as other functions including I2C. pigpio has a client-server architecture , which enables you to remotely control GPIO pins.
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the way an operating system organises its data on the storage (usually non-volatile, like an SD card) available to it.
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an event-based, asynchronous I/O framework that uses Google's V8 JavaScript engine. Node.js is commonly used for heavy client-server JavaScript applications.
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the job scheduler in Linux and other Unix-like operating systems. It enables users to schedule tasks to run non-interactively at specified intervals or predefined times, including upon reboot.
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Electrical device which, when energised by a small electrical current (low-power, control circuit), safely switches a larger electrical current (controlled circuit).
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A widely used, general-purpose scripting language designed for web development. This topic covers the use of PHP and how to host PHP web servers on the Raspberry Pi.
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For questions pertaining to the Chromium browser, its installation, configuration and troubleshooting on the Raspberry Pi
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a C language library for accessing GPIO pins.
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Questions about software, hardware or network performance. Please use as a supplement for other, more specific tags.
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for questions pertaining to the acceptable temperature ranges for the Pi and its respective parts.
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For questions pertaining to ALSA, the Linux sound subsystem. ALSA sits below advanced systems like PulseAudio.
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the raspbian configuration tool for the Raspberry Pi.
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For questions about how to automate one's home with the Raspberry Pi. Home Automation allows control of lights, security systems, and other home appliances.
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For questions about Raspbian Wheezy, the Raspberry Pi operating system based on Debian 7 ("Wheezy"). It was superseded by Raspbian Jessie in April 2015 and Stretch in June 2017. Use this tag only wher…
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Questions on how to compile software for the Raspberry Pi using other devices.
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For questions pertaining to the Apache web server.
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a virtual private network. It extends a private network across a public network (e.g. the internet) by dedicated connections, virtual tunneling, or traffic encryption. VPNs can be used to sec…
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Questions about what and how to backup your Raspberry Pi
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the Open Embedded Linux Entertainment Center. It's a small Linux distribution for playing media.
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a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy.
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For questions pertaining to running, configuring, installing or troubleshooting the Xorg Server on the Raspberry Pi.
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A free open source software motion detector for CCTV software applications developed for Linux.
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Questions related to security of data on the Raspberry Pi. Also includes questions on using it in a security system (e.g. as a firewall).
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a motor, commonly used in robotics projects. This tag is for questions about the servo motor when using it in robotics and other projects.
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a feature of electrical appliances to enter a low-power state when inactive to reduce energy consumption.