HTML is a Language that is used to create a specific part of the web page by using code editors and web browsers. HTML is the first web browser introduced in 1993 but the standard version of HTML was introduced in 1995. Later several versions of HTML were introduced and still people are using HTML 4.01 then a new version of HTML5's first draft was announced in January 2008 now days many organizations are working with HTML5.

CSS is short for Cascading Style Sheets and is the primary language used to describe the look and formatting for webpages across the Internet and documents of markup (e.g. HTML and XML) in general. CSS3 is an extended or enhanced version of CSS2 and it is the latest standard used in defining the styles for the different elements of a web page and even more. This includes animating the elements of a web page and applying different effects such as gradients, shadows, and many more.

Bootstrap is a free and open-source front-end development framework for the creation of websites and web apps. The Bootstrap framework is built on HTML, CSS, and JavaScript (JS) to facilitate the development of responsive, mobile-first sites and apps.
Responsive design makes it possible for a web page or app to detect the visitor’s screen size and orientation and automatically adapt the display accordingly; the mobile-first approach assumes that smartphones, tablets, and task-specific mobile apps are employees’ primary tools for getting work done and addresses the requirements of those technologies in design.
Bootstrap includes user interface components, layouts, and JS tools along with the framework for implementation. The software is available precompiled or as source code.

JavaScript is a lightweight scripting language used to create network-based applications. It is very easy to implement as it is integrated with Java and HTML programming languages. JavaScript is an open and cross-platform programming language that involves both functional programming and object-oriented features.

jQuery is a powerful, easiest, popular, and open-source JavaScript API released in 2006 and it is a JavaScript-based library that makes use of JavaScript much easier for web development-based applications.