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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 software (typically Web apps) running on a server you control
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where interaction with mobile devices plays a central role (e.g. Making calls, checking messages, displaying content)
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An iOS app specifically directed to iPhones
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Software to display, search, or otherwise process geographical maps
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Data Analysis tools enable you to take a set of data and extract abstract information out of them.
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when looking for recommendations for software/web-apps that analyze/create/use CSS (cascading style sheets)
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Stream of debugging-information from a program, usually with timestamp and other meta information. Use when you want to analyze, display or otherwise interact with log files / streams.
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when asking questions relating to optical character recognition software.
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Generic software that displays multimedia content. Combine with "video", "audio" or other appropriate tag that makes clear what media you want to play.
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Visually representing any concept, emotion, or item. Drawings can be generated by humans, animals, or computers.
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when asking for recommendations concerning remote access software and remote access clients.
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Structured Query Language - a language designed for interacting with databases.
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For questions asking for game recommendations meeting specific criteria.
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when asking for software that monitors network traffic, intrusions and connection stability (amongst others).
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Software required for a computer to enable it for delivering content from a private or public website.
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graphical representation of data. Charts can help you visualize vast amounts of data in a way that is easily understood.
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when asking for image editing software. When asking questions using this tag ensure that you include information relating to the formats you want support for and the key features you requ…
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Software that transmits audio or video, or both, over the internet.
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if you're looking for either an application which can or should store its data in the cloud or if you're looking for a server-side software providing cloud-based storage.
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For recommendations for software that interoperates with the Microsoft Excel spreadsheet software.
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Software specifically for Windows 8. Please tag with [windows] instead unless your question involves functions specific to Windows 8.
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The process of storing, processing and accessing data and information.
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Software for recording screen and audio activity on your computer, such as recording software demonstrations and game play in games.
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Software that reads or modifies XML content.
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when seeking recommendations for email clients. An email client is any program used to view email.
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for recommendations related to download managers and accelerators.
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when including markdown as a feature requirement when seeking a recommendation.
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For software that processes data encoded in JavaScript Object Notation.
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if you're looking for a wiki implementation/engine, converters between different wiki syntaxes, wiki plugins, or similar wiki-related software.