R is a free, open-source programming language and software environment for statistical computing, bioinformatics, and graphics. Please supplement your question with a minimal reproducible example. For statistical questions please use http://stats.stackexchange.com.
Xcode is 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 Mac programming questions, and [cocoa-touch] or [ios] for iOS programming questions.
HTML5 (Hyper Text Markup Language, version 5) is an umbrella term for recent web technologies. It is also the latest iteration of HTML Became a W3C Recommendation in October 2014, introducing new elements and APIs.
Django is 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.
Visual Basic.NET (VB.NET) is a multi-paradigm, managed, type-safe, object-oriented computer programming language. Along with C# and F#, it is one of the main languages targeting the .NET Framework. VB.NET can be viewed as an evolution of Microsoft's Visual Basic 6 (VB6) but implemented on the Microsoft .NET Framework. DO NOT USE this tag for VB6, VBA, or VBScript questions.
A string is a finite sequence of symbols, commonly used for text, though sometimes for arbitrary data.
Node.js is an event-based, non-blocking, asynchronous I/O framework that uses Google's V8 JavaScript engine. It is used for developing applications that make heavy use of the ability to run JavaScript both on the client, as well as on server side and therefore benefit from the re-usability of code and the lack of context switching.
Eclipse is an open source IDE and platform for building applications. There is a wide variety of plugins for various programming languages and other development-oriented tools (such as modeling, database browsing, etc.). This tag should only be used for questions specifically about the Eclipse IDE or platform, not for generalized (Java, Android, etc.) programming topics.
Windows is a family of client, server, and mobile operating systems developed by Microsoft. Use this tag only if your question relates to using Windows APIs or Windows-specific behavior. Questions relating to using or troubleshooting Windows are off-topic.
A database is an organized collection of data typically used to model certain situations. Use this tag if you have questions about designing a database. If it is about a particular database management system, (e.g., MySQL), please use that tag instead.