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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 the video resolution 1080p, also known as "full-HD."
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A serial communication protocol providing data communication and power transmission over a single line.
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For questions relating to 64-bit computing.
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if your question relates to making your device/program accessible to a larger audience.
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if your question relates to connecting your pi to a wireless access point, or making your pi one.
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For questions involving the Pi's SD card activity LED (labelled ACT). Use this tag where the LED's operation is relevant, for example if the LED is functioning incorrectly, or may be indicating a prob…
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The green activity LED blinks on both read and write activity on the SD card. On newer models it is connected to a GPIO expander , which is connected via I²C to the SoC.
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"A structured, statically typed, imperative, wide-spectrum, and object-oriented high-level computer programming language, extended from Pascal and other languages." (Wikipedia)
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if your question relates to Adafruit products.
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This refers to Amazon's interactive virtual assistant, which can be deployed on a Raspberry Pi.
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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 methods for powering the Raspberry Pi via sources other than its micro-USB connection.
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For questions pertaining to signal conversion, either through hardware or software.
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For questions pertaining to Android, the Linux-based touch-enabled operating system designed for mobile devices.
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an operating system for the Internet of Things based on the mobile OS of the same name. It supports common peripherials like GPIO, SPI and I²C with a single headed or headless app. O…
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For questions pertaining to the Apache web server.
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a package manager used on Raspbian and includes commands such as 'apt-get'.
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For questions pertaining to `aptitude`, it's usage and troubleshooting.
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a lightweight and flexible Linux® distribution that tries to Keep It Simple.
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an Arduino that fits over 26-pins of the Pi breakout and allows the use of normal Arduino shields, and direct communication with the Pi via UART. It can be programmed from the Pi usi…
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For questions pertaining to the Arduino microcontroller and it's integration with Raspberry Pi projects. Questions about Arduino only are off-topic and can be asked at Arduino Stack Exchange.
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Questions related to the CPU and instruction set of the Raspberry Pi. See also: cross-compiling
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For questions pertaining to compiling code.
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A low-level programming language providing symbolic representation of machine code.
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The Raspberry Pi has an analogue stereo audio jack output (Pi 1 A/B/B+, Pi 2, not Pi Zero), and audio can also be heard through the digital HDMI output (all models).
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For questions pertaining to the hardware and software necessary to play back audio.
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Questions about what and how to backup your Raspberry Pi
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low-level programming of a computer without any operating system or the development of own custom operating systems
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For questions pertaining to the `bash` shell command processor.