An Internet Protocol address (IP address) is a numerical label assigned to each device in a computer network that uses the Internet Protocol for communication. This is a general tag that covers both IPv4 (like 172.168.100.1) and the newer IPv6 (like 2012:da8:0:1234:7:577:8:2). If you specifically mean any of these, use IPv4 or IPv6 tags.

The Android Java Canvas (android.graphics.Canvas)

RichFaces was a component library for JSF and an advanced framework for easily integrating AJAX capabilities into business applications. It reached end-of-life in June 2016.

Emacs Lisp is the extension language for the GNU Emacs text editor, and in fact, most of the functionality of Emacs is implemented using Emacs Lisp. Users generally customize Emacs' behavior by adding Emacs Lisp statements to their `~/.emacs`, or writing separate packages.

Middleware is computer software that provides services to software applications beyond those available from the operating system. It can be described as "software glue".

Computational Complexity Theory is a branch of the theory of computation in theoretical computer science and mathematics that focuses on classifying computational problems according to their inherent difficulty. Particularly common in programming is *amortized analysis* for time or space. Questions must relate to programming. For theoretical Computer Science questions, please ask on https://cs.stackexchange.com/.

YARN (Yet Another Resource Negotiator) is a key component of second generation Apache Hadoop infrastructure. DO NOT USE THIS for the JavaScript/Node.js Yarn package manager (use [yarnpkg] instead)! Originally described by Apache as a redesigned resource manager, YARN is now characterized as a large-scale, distributed operating system for big data applications including next generation MapReduce (MR2).

This tag is for Yarn v 1.x. See version-specific tags, as version differences are significant. Yarn is an open-source JavaScript package manager. With Yarn, engineers have access to the npm registry and can install packages quickly, and manage dependencies consistently across machines or in secure offline environments.

Quartz Scheduler is a Java-based open-source job scheduling service. NOTE: this tag is about the Java framework. For .NET questions please use [quartz.net] instead. For Clojure questions please use [quartzite] unless you're directly interoping with the Java library.

Gallery is a collection of photos in a software system

An error received when combining individually compiled object files into executable code.