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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when requesting information about laptops or notebook computers. These devices have an integrated hardware keyboard and screen.
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For questions about standalone video- and graphics-processing PCIe cards. Do not use this tag for on-board CPU or motherboard graphics questions.
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For questions about central processing units (CPUs) used in anything from micro-PCs to servers and workstations.
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For questions asking for a device that communicates over USB, Universal Serial Bus.
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For questions relating to the main control and interconnection component of a computer. Beware - a number of questions on this subject are off-topic.
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For questions concerning hardware that will be used for gaming.
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store information for later use by a computing device.
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For questions about devices that use or interface with Linux-based systems (such as Ubuntu).
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an abbreviation for personal computer. Use this tag for questions about PCs as a whole. Do not use this tag along with the [desktop] or [laptop] tags.
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For questions about devices that use magnetic disk storage as a data storage mechanism.
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when searching for devices for wireless network access. This can include devices such as routers, wireless extenders, wireless access points and more.
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For questions about computers consisting of a non-portable tower where all components are housed inside a case.
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For questions about external display units for computers and other computing platforms such as consoles. Use the [displays] tag if the screen is embedded into the hardware in question.
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For questions about devices that use electronic state (via NAND/NOR) to store data.
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For questions concerning the wired or wireless communication between computing platforms.
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For questions concerning the existing or potential wireless functionality of a computing device. Use the [remote-control] tag if the device is not directly related to computers.
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A device that handles the connection between two networks and forwards packets between the two networks. In a home environment, these would be the Internet and the local home network. This tag is for …
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For questions about devices that allow character-based text input into a computer.
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For questions about hardware that will be used in running a certain type of server such as a web server or VPS. Use this tag for questions about about which type of server to use.
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For questions about devices that use electronic signal variation to produce audible sounds.
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A mobile operating system developed by Google. Use this tag for products that run any version of the Android operating system.
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A mobile phone with an integrated computer and features not generally associated with a telephone. Use this tag when asking about advanced mobile phones and features beyond placing a telephone call on…
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For questions about devices that automatically supply and/or regulate electrical power for other devices. Do not use this tag for questions about PC power supplies (see the [smps] tag).
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when searching for a handheld device, larger than the size of cellular phone, that accepts input via a touch screen.
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For questions about devices that have a High Definition Multimedia Interface input/output capability.
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For questions about devices that use a Bluetooth protocol interface to communicate.
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For questions about devices used for development. This tag is VERY broad; DO NOT use as the only tag on your post.
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For questions about the do-it-yourself single-board PC. This tag should only be used when asking about add-ons for the Raspberry Pi.
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An operating system developed by Microsoft. Use this tag if you are requesting hardware that operates in the Microsoft Windows environment. You should also include minimum version of Windows that the …
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store data, such as hard drive or solid state disks, or flash memory such as SD cards or USB memory sticks.
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An abbreviation for Peripheral Component Interconnect Express. For questions related to the connectivity between a motherboard and its bus devices (e.g., a graphics card).
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For questions about devices that use audiovisual protocols to display video via an output device.
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For questions about protective cases for hardware. Consider using the [enclosure] tag as well.
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For questions about geokinetic co-ordinate based input peripherals, also known as mice.
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For questions about devices that output text or graphics to paper or another printable medium.
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internally incorporated in a larger device (e.g., smartphones and e-readers). Use this tag to ask about hardware that will have a screen.