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Computer code or program code is the set of instructions forming a computer program which is executed by a computer. It is one of two components of the software which runs on computer hardware, the other being the data. Computers can only directly execute the machine code instructions which are part of their instruction set. Because these instructions are difficult for humans to read, and writing good programs in machine code or other low-level programming languages is a time-consuming task, most programmers write in the source code of a high-level programming language. This source code is translated into machine code by a compiler or interpreter so that the computer can execute it to perform its tasks. A compiler produces object code which is usually in machine language but may also be in an intermediate language which is at a lower level than the source. A runtime system is often used to execute object code by linking it with commonly used libraries. Bytecode is a lower level of source which is designed for more efficient interpretation by interpreters

From 1991 to 1999, HTML developed from version 1 to version 4. In year 2000, the World Wide Web Consortium (W3C) recommended XHTML 1.0. The XHTML syntax was strict, and the developers were forced to write valid and "well-formed" code. In 2004, W3C's decided to close down the development of HTML, in favor of XHTML. In 2008, the first HTML5 public draft was released. In 2012, WHATWG and W3C decided .

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Cascading Style Sheets, fondly referred to as CSS, is a simple design language intended to simplify the process of making web pages presentable. CSS handles the look and feel part of a web page. Using CSS, you can control the color of the text, the style of fonts, the spacing between paragraphs, how columns are sized and laid out, what background images or colors are used.

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JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, multi-paradigm, dynamic language. javascript is also useful in form validation.

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jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.

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Build responsive, mobile-first projects on the web with the world’s most popular front-end component library. Bootstrap is an open source toolkit for developing with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system.

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PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.What distinguishes PHP from something like client-side JavaScript is that the code is executed on the server.

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