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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JavaScript (not to be confused with Java) is a dynamic, weakly-typed language used for client-side as well as server-side scripting. Use this tag for questions regarding ECMAScript and its various dia…
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Java (not to be confused with JavaScript or JScript) is a general-purpose object-oriented programming language designed to be used in conjunction with the Java Virtual Machine (JVM). "Java platform" i…
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a multi-paradigm programming language encompassing strong typing, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines, dev…
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a general-purpose programming language primarily designed for web development.
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Android, used for programming or developing digital devices (Smartphones, Tablets, Autos, TVs, Wear, Glass), is Google's mobile OS. Please use Android-specific tags such as android-intent, not intent,…
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a popular cross-browser JavaScript library that facilitates DOM (Document Object Model) traversal, event handling, animations, and AJAX interactions by minimizing the discrepancies across br…
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a dynamic and strongly typed programming language designed to emphasize usability. Two similar but mostly incompatible versions of Python are in widespread use (2 and 3). If you have a versi…
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the standard markup language used for structuring web pages and formatting content. HTML describes the structure of a website semantically along with cues for pres…
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a general-purpose programming language. It was originally designed as an extension to C, and keeps a similar syntax, but is now a completely different language. Use this tag for questions about…
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the mobile operating system running on the Apple iPhone, iPod touch, and iPad. Use the tag [ios] for questions related to programming for the iOS platform. Use the related tags [objective-c] an…
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a style sheet language used for describing the look and formatting of HTML (Hyper Text Markup Language), XML (Extensible Markup Language) documents and SVG elements inc…
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a freely available, open source Relational Database Management System (RDBMS) that uses Structured Query Language (SQL). Do not confuse this with PHP's MySQLi connector, which is part of PHP
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a language for querying databases. Questions should include code examples, table structure, sample data, and a tag for the DBMS implementation (e.g. MySQL, PostgreSQ…
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a Microsoft web application development framework that allows programmers to build dynamic web sites, web applications and web services. It is useful to use this tag in conjunction with the…
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should be used only on questions that are about Objective-C features or depend on code in the language. The tags [cocoa] and [cocoa-touch] should be used to ask about Apple's frameworks or cl…
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an open source full-stack web application framework written in Ruby. It follows the popular MVC framework model and is known for its "convention over configuration" approach to applic…
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a software framework designed mainly for the Microsoft Windows operating system. It includes an implementation of the Base Class Library, Common Language Runtime (commonly referr…
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a general-purpose computer programming language used for operating systems, libraries, games and other high performance work. It is clearly distinct from C++. It was developed in 1972 by Dennis R…
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unless you are addressing Apple's iPhone and/or iPod touch specifically. For questions not dependent on hardware, use the tag [ios]. Another tag to consider is [cocoa-touch] (but n…
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an open-source JavaScript framework. Its goal is to augment browser-based applications with Model–View–Whatever (MV*) capability and reduce the amount of JavaScript n…
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an ordered data structure consisting of a collection of elements (values or variables), each identified by one (single dimensional array or vector) or multiple indexes.
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a relational database management system (RDBMS). Use this tag for all SQL Server editions including Compact, Express, Azure, Fast-track, APS (formerly PDW) and Azure SQL DW. Do…
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a textual data interchange format and language-independent. Use this tag when this text format is involved, but not for native JavaScript objects.
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a multi-platform open-source, dynamic object-oriented interpreted language, created by Yukihiro Matsumoto (Matz) in 1995. The [ruby] tag is for questions related to the Ruby language, includin…
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a free, open-source programming language and software environment for statistical computing, bioinformatics, and graphics. Please supplement your question with a minimal reproducible example. Use…
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a technique for creating seamless interactive websites via asynchronous data exchange between client and server. AJAX facilitates communication with the serve…
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Regular expressions provide a declarative language to match patterns within strings. They are commonly used for string validation, parsing, and transformation. Since regular expressions are not fully …
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an event-based, non-blocking, asynchronous I/O framework that uses Google's V8 JavaScript engine and libuv library. It is used for developing applications that make heavy use of the ability…
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a flexible, structured document format that defines human- and machine-readable encoding rules.
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an open source web application framework and tooling that implements a version of the model-view-controller (MVC) pattern tailored towards web applications and built upon …
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an open source operating system. Use this tag only if your question relates to *programming* using Linux APIs or Linux-specific behavior. Questions relating …
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an open source web application framework, written in Python. Django is designed to reduce the effort required to create complex data-driven websites and web applications.
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Windows Presentation Foundation (WPF) provides developers with a unified programming model for building modern line-of-business desktop applications on Windows.
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an open-source programming language developed by Apple. Use the tag only for questions about language features, or requiring code in Swift. Use the tags [ios], [osx], [watch-os], [tvos], [coc…
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an organized collection of data. It is the collection of schemas, tables, queries, reports, views, and other objects. The data are typically organized to model aspects of reality in a wa…
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Apple's integrated development environment (IDE). USAGE NOTE: Use this tag only for questions about the Xcode IDE itself, and not for general Mac or iOS programming topics. Use [cocoa] for Ma…