jQuery is a popular cross-browser JavaScript library that facilitates DOM (Document Object Model - HTML Structure) traversal, event handling, animations, and AJAX interactions by minimizing the discrepancies across browsers and providing an easy-to-use API.

JavaScript is a dynamic, weakly-typed language typically used for client-side scripting. Use this tag for questions regarding ECMAScript and its various dialects/implementations (excluding ActionScript). Unless a tag for a framework/library is also included, a pure JavaScript answer is expected.

PHP is a popular general-purpose weakly-typed server-side scripting plus object oriented programming language that is especially suited for web development.

HTML (HyperText Markup Language) is the standard markup language used for structuring web pages and formatting content. HTML describes the structure of a website semantically along with cues for presentation, making it a markup language, rather than a programming language. The most recent revision to the HTML specification is HTML5.

A freely available open source Relational Database Management System (RDBMS) that uses Structured Query Language (SQL). If your issue relates to MySQLi, use the MySQLi tag instead.

CSS (Cascading Style Sheets) is a style sheet language used for describing the look and formatting of HTML (Hyper Text Markup Language) and XML (Extensible Markup Language) documents including (but not limited to) colors, layout, and fonts.

JSON (JavaScript Object Notation) is a 100% textual data interchange format originally inspired by JavaScript objects. It is widely used in RESTful web services. Parsers for JSON exist in nearly all languages, and libraries also exist which can deserialize JSON to native objects or serialize native objects to JSON.

AJAX (Asynchronous JavaScript and XML) is a technique for creating seamless interactive websites via asynchronous data exchange between client and server. AJAX facilitates communication with the server or partial page updates without a traditional page refresh.

A lightweight open source web application framework that utilizes the MVC architecture to quickly develop web applications.

Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.