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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 and issues on the usage and installation of LineageOS.
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a web mapping service and an Android app.
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if you have an issue related with an application or part of the operating system, that ceases to function properly leading to a freeze or a "force close" message.
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a division of either your internal storage or your sdcard.
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for questions specific to a Sony Xperia phone not covered by a more specific tag as e.g. "sony-xperia-z" or "sony-xperia-arc"
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A library used by Google apps and many third-party apps to provide location and social functionality
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a secret word or string of characters used for user authentication/authorization.
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Trigger actions to be automatically executed on specific events, such as e.g. time, location, key-presses -- or even sensors, connected networks, etc. This tag is for "generic" questions on the field;…
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About managing your files on Android: copy/move, delete, open, and other file related actions. Please click the 'info' link for more details.
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a display that can detect and locate a touch within the display area.
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Questions regarding songs in your android device. The quality, bit-rate, size and file types is considered relevant to this tag. This should not be confused with audio and/or music-player
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Mounting takes place before a computer can use a storage device. The command to make a storage device accessible is under *nix "mount"
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For questions about the internal procedures and processes of the Android system.
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an integrated circuit that securely stores the data used to identify a subscriber within a mobile network.
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For questions about the native Android app. Questions about the web interface on the desktop are off-topic here.
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Generic tag for HTC devices. Use it only if a device tag is needed for a HTC device, and there's not better matching tag. See the full tag-wiki for more details.
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Removing installed apps from device.
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for questions about language support for the Android system and keyboards. See also the 'localization' tag if your question is about apps supporting your native language.
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For issues caused by a broken screen/digitizer
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For questions concerning the device firmware (as opposed to e.g. the 'radio-firmware'). See the full tag wiki for details, explanations, and hints.
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a specification that allows USB devices (audio players, mobile phones, etc.) to act as a host, allowing other USB devices to be attached to them.
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For questions regarding operating memory (RAM) in an Android device. Please do not use this tag for questions concerning storage space and disk usage, use the "internal-storage" tag instead.
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a central component of most computer operating systems. It acts as bridge between applications and the hardware and also manages the systems's resources.
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for issues with your device having locked you out and won't let you in anymore. See the full tag wiki for details and some first-aid hints.
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The launcher consists of the home screen and the app menu. As the name suggests, a launcher is the component responsible for launching apps. You can easily exchange the launcher of your android phone …
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The bar at the top of the screen in the Android OS, where the time is displayed, along with small icons corresponding to notifications from the Android system and user applications.
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a radio network distributed over land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base station. In a cel…
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Android's default photo and video viewing and management app. Please only use this tag if your question is specific to the Gallery app.
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the way of providing a command prompt to Android devices.
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using a smartphone to act as a modem for another device.
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if you feel your question is specific to Android 8.0 Oreo. It was officially released on August 21, 2017, on Pixel and Nexus devices.
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File related issues. See also if another tag might better fit your question: 'file-system', 'file-management', or one of the 'storage' tags
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when your question has to do with an error message.
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characterized by the amount of useful work accomplished by a computer system compared to the time and resources used (Wikipedia).
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made to play music. These can be identified as audio players as well. The primary purpose of these applications are to enable the user to listen to songs continu…
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if your question is specific to Android 7.1 Nougat, an update from Android 7.0.