Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
Unity is a cross-platform game engine by Unity Technologies. Questions should be about programming with the game engine and not usage of the graphical interface. Questions about the usage of the graphics interface are off topic.
75302 questions
Authentication is the process of providing a proof of identity or verifying identity.
74922 questions
Symfony refers to both a PHP framework for building web applications as well as a set of components on which the framework is built.
This tag refers to the currently supported major versions 3.x, 4.x, 5.x and 6.x. Alternatively, you can specify an exact version using the respective tag. This tag should not be used for questions about Symfony 1.x. Please use the Symfony1 tag instead.
73565 questions
Directory-level configuration file used by Apache web servers. Use this tag if and only if .htaccess content is directly involved in the topic. We know many people are using .htaccess, but kindly ask the members of the community to not use this tag, unless you know it is on-topic in your question. Also notice what the [tag:apache] tag has to say about questions about _configuring_ Apache httpd and their potential off-topicness on Stack Overflow
72915 questions
OpenCV (Open Source Computer Vision) is a library for real time computer vision. When using this tag, please add a language specific tag (python, c++, ...), if relevant.
72729 questions
T-SQL (Transact Structured Query Language) is the extension of SQL functionality supported by Sybase ASE and Microsoft SQL Server. Do not use this tag for MySQL, PostgreSql, Oracle(Pl/SQL) related queries.
Please note that SQL code which is being written using LINQ will not also be the part of this tag. This tag specifically created for advanced SQL programming using Microsoft SQL Server.
72684 questions
[google-chrome] is for questions related to development with Google Chrome, a web browser that uses the Blink rendering engine. Warning! General support for the browser is off-topic: questions about using or configuring the browser should be posted on https://superuser.com. Chrome OS and Chromium are off-topic: questions about [google-chrome-os] or [chromium] should use those tags.
71967 questions
A for loop is a control structure used by many programming languages to iterate over a range. It is a way of repeating statements a number of times until the loop ends. Depending on the language this may be over a range of integers, iterators, etc.
71492 questions
Matplotlib is a plotting library for Python which may be used interactively or embedded in stand-alone GUIs. Its compact "pyplot" interface is similar to the plotting functions of MATLAB®.
71303 questions
Go is an open-source programming language, with a syntax loosely derived from C. It's statically typed, with limited dynamic typing capabilities; it also features automatic memory management, built-in concurrency primitives, variable-length arrays – called slices –, and a large standard library.
70688 questions
A DateTime object in many programming languages describes a date and a time of day. It can express either an instant in time or a position on a calendar, depending on the context in which it is used and the specific implementation. This tag can be used for all date and time related issues.
70365 questions
CodeIgniter is an Application Development Framework - a toolkit - for people who build websites using PHP. Created by EllisLab & fostered by BCIT it is now a project of the CodeIgniter Foundation. The framework implements a modified version of the Model-View-Controller design pattern. Use this tag for questions about CodeIgniter classes, methods, functions, syntax, and use. There are two major versions: 3.x and 4.x, addressing different system requirements
69561 questions
Hypertext Transfer Protocol (HTTP) is an application level network protocol that is used for the transfer of content on the World Wide Web.
67879 questions
Perl is a procedural, high-level, general-purpose, dynamic programming language, known for its native support of regular expressions and string parsing capabilities. Please use this tag for questions about Perl in general. For things related to the new (but related) language Raku (formerly "Perl 6"), please use the raku tag. For Perl-style regular expressions in other languages, use the regex tag, or, if they are based on the PCRE library, the pcre tag.
67820 questions
Validation is used to check data to make sure it fits whatever required specifications are set for it. Typically Validation is used in checking input data, and in verifying data before storage.
67160 questions
An endpoint of a bi-directional inter-process communication flow. This often refers to a process flow over a network connection, but by no means is limited to such. Not to be confused with WebSocket (a protocol) or other abstractions (e.g. socket.io).
66255 questions
Google Maps is a desktop and mobile web mapping service application and technology provided by Google, offering satellite imagery, street maps, and Street View perspectives. Also supported are maps embedded on third-party websites via the Google Maps API, and a locator for urban businesses and other organizations in numerous countries around the world.
65879 questions
An object is any entity that can be manipulated by commands in a programming language. An object can be a value, a variable, a function, or a complex data-structure. In object-oriented programming, an object refers to an instance of a class.
64898 questions
UITableView is a class used for displaying and editing lists of information on iOS. A table view displays items in a single column. UITableView is a subclass of UIScrollView, which allows users to scroll through the table, although UITableView allows vertical scrolling only.
64456 questions
Extensible Application Markup Language (XAML) is a declarative XML-based language used for initializing structured values and objects in various frameworks. When a question is about the usage of XAML with a specific framework a tag for the framework should also be provided e.g. [wpf] (Windows Presentation Foundation), [silverlight], [windows-phone], [windows-store-apps] (Windows 8 store apps), [win-universal-app], [xamarin.forms] or [workflow-foundation]
61979 questions
Object-oriented programming is a programming paradigm using "objects": an encapsulation consisting of data fields and methods together with their interactions.
61861 questions
An "if" statement is a flow control structure in most programming languages that branches execution flow depending on a binary condition, generally evaluated at runtime. If statements are also commonly also called conditionals.
When using this tag please also include an appropriate language tag, such as e.g. "java" if your question is language-specific.
61703 questions
Apache Cordova (formerly PhoneGap) is a framework that allows developers to create cross-platform mobile applications using web technologies like HTML, JavaScript, and CSS.
61605 questions
GENERAL UBUNTU SUPPORT IS OFF-TOPIC. Support questions may be asked at https://askubuntu.com/. Ubuntu is a free desktop and server operating system based on Debian GNU/Linux. This tag is for programming questions specific to Ubuntu.
60820 questions
A "web service" is a software system designed to support interoperable machine-to-machine interaction over the World Wide Web.
60164 questions
Use this tag for questions involving code to send or receive email messages. Posting to ask why the emails you send are marked as spam is off-topic for Stack Overflow. Questions about configuration of mail servers belong on Server Fault.
59268 questions
A layout defines the visual structure for a user interface, such as the UI for an activity, fragment or app widget.
59114 questions
A framework for building Java web applications based on the Model-View-Controller (MVC) pattern. It promotes flexible and decoupled code from the underlying view technologies.
58288 questions
Elasticsearch is a free and open, distributed, RESTful search engine based on Lucene.
58010 questions
KUBERNETES QUESTIONS MUST BE SPECIFICALLY RELATED TO SOFTWARE DEVELOPMENT. Configuration and deployment is off-topic here. A good rule of thumb is, if it happens outside the pod, it's probably off-topic. If it's about code running inside the pod, it's probably OK.
57333 questions
Microsoft Access, also known as Microsoft Office Access, is an application development and database development tool from Microsoft. It combines the Microsoft Jet/ACE Database Engine with a graphical user interface and software-development tools. Other database engines, such as SQL Server, can also be used as a database server for Access applications.
57313 questions
Parsing refers to breaking an artifact into its constituent elements and capturing the relationship between those elements. This tag isn't for questions about the self hosted Parse Platform (use the [parse-platform] tag) or parse errors in a particular programming language (use the appropriate language tag instead).
57220 questions
User Interface (UI) is the system through which people interact with a computer. This tag can be used for UI-related programming questions. Note that there's a separate Stack Exchange site for User Interfaces, Interactions with the Computer and User Experience design: https://ux.stackexchange.com.
56892 questions
GitHub is a web-based hosting service for software development projects that use Git for version control. Use this tag for questions specific to problems with repositories hosted on GitHub, features specific to GitHub, and using GitHub for collaborating with other users. Do not use this tag for Git-related issues simply because a repository happens to be hosted on GitHub.
56809 questions
Use this tag for code that must compile as C++11 (not using any features introduced in C++14 or later).
56486 questions
Visual Studio Code is a text editor available for Linux, Mac, and Windows. You can also use this tag for unofficial binaries of the portion of the code that is open source (such as VSCodium) as well. It includes support for debugging, embedded Git control, various extensions and rich development experiences such as intelligent code completion. It is mainly developed by Microsoft, and built on Electron like GitHub's Atom.
56460 questions