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.

Type to find tags:
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Questions on obtaining files and directory structure/information and manipulating the said structure/information, searching/renaming particular files in a directory, etc., in an OS independent manner.
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Questions about Mathematica's date and time functions.
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Questions on the Computable Document Format (CDF) that allows Mathematica notebooks to be embedded within media for easy viewing and manipulation. Do not use this tag for questions on cumulative distr…
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Questions on the special mathematical functions implemented in Mathematica.
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a suite of Mathematica functions that implement a protocol for the communication/interfacing of Mathematica with external programs.
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Questions on the discrete and continuous Fourier analysis functions of Mathematica, as well as the FourierSeries` package.
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Questions about the function Assuming[], the $Assumptions system variable, and the Assumptions option of functions such as Simplify[] and Integrate[].
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Questions on the application of Mathematica to geometric problems. You might also consider adding the [graphics] tag, if appropriate.
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the back-end application thread that does the actual evaluation of all non-graphical expressions. It can be accessed directly through the console but is more commonly working behind the…
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GUI-construction involves everything that is used to programmatically construct a custom graphical user interface under Mathematica.
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Tag for questions about building histograms in Mathematica. Apart from generating the graphics, and prettifying them, this also includes methods to extract their data.
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Questions relating to working with textual information: textual analysis, data mining, etc.
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Questions on the use of Mathematica in combinatorics, including the Combinatorica add-on package.
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intended for the review and improvement of style for already functioning code. It not meant to change the objective of the code.
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Questions relating to the importing, exporting, and extraction of data from PDF files
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Styles define how Mathematica notebooks, cells and expressions are formatted, displayed, evaluated and interacted with.
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Questions on the sorting/ordering functions of Mathematica (Sort, SortBy, Ordering, etc.).
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Questions about making your own documentation similar to the built-in documentation style. Also about finding things in the documentation, working with the documentation, errors in the documentation, …
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the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attribu…
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Questions relating to different typefaces and their use in various Mathematica outputs, including graphics, notebooks and exported output.
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Questions about any kind of interaction with $\TeX$, $\LaTeX$, and friends, including transferring text/code to/from $\TeX$, using Mathematica graphics in LaTeX documents etc.
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Questions related to the application of Mathematica to problems in physics.
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For questions specific to Version 8 of Mathematica.
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Questions related to displaying identifiable labels in graphics or any other expressions, such as in `AxesLabel` and `Labeled`. Not to be confused with Goto-Label.
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Questions on trigonometric and hyperbolic functions, as well as their inverses, in Mathematica.
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Questions on the associative data-structure introduced in Mathematica version 10.
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Questions on using or implementing more or less common data structures such as linked lists, structs, trees, tries, heaps etc. in Mathematica.
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Questions on filtering or selecting data based on certain criteria. This is to be used with primary tags such as list-manipulation, string-manipulation or signal-processing, with the primary tag indic…
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for questions that involve tensors. Tensors are fundamental tools for linear computations, generalizing vectors and matrices to higher ranks. Mathematica 9 introduces powerful methods to …