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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for questions that came from the Project Euler website.
× 13 × 13
× 52 × 2
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Tag for questions meant as a puzzle for the Mathematica.stackexchange.com public or about solving puzzles using Mathematica.
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× 10 × 5
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Questions about random number generation and the properties of numbers so generated.
× 16 × 8
× 10
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For questions about defining recursive functions, recursive algorithms and solving recursive equations.
× 2
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for requests for books, online resources, etc. that deal with the Mathematica system and its applications. This tag is also for asking references for algorithms used within Mathematica.
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× 36
× 19
For questions about the function RegularExpression which is used in string patterns in functions as StringCases, StringReplace, StringPosition,StringCount etc.
× 47
For questions about accessing a kernel on a remote/different computer either directly from the front-end or as a slave kernel to a locally running master kernel.
× 18
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Questions about Mathematica's rule-based replacement functionality, including functions such as Rule (->), Replace, ReplaceAll (/.) and ReplaceRepeated (//.).
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× 3 × 8