Accessibility
The practice of designing a product or a website to make it available to as many people as possible, regardless of their physical abilities. On the web, this can include using subtitles on video or employing text markup protocols that ensure the content will work with assistive devices (for example, to read the text out loud).

Web design using CSS3
Cascading Style Sheets are sets of instructions for web browsers.They define the presentation and consistency of documents — for example, the layout and the fonts — and they're often separate from the web-page content. By using style sheets, the same content can display in different ways on a mobile device, a desktop computer, or a PDF. CSS3 is the newest implementation of that markup language and enables responsive markup.

Device detection
When a device accesses a website, it sends descriptive information to the server. A site host can use this information to detect a mobile device and tailor the content for it through style sheets, scripts, and other methodologies. Some detection can also be done client-side.

Web design using HTML5
The fifth revision of HyperText Markup Language, the core language for presenting content on the web. HTML5 includes new syntax such as tags for video that is responsive and will also play in many browsers without requiring end users to install proprietary plug-ins.

Media query
In CSS, web developers can define a media typesuch as screen or print, and specify the look of the content by specifying conditions such as width, height, or orientation. A media query combines a media type and a condition to specify how web content will appear on a particular receiving device.

Native app

A software application developed specifically to run on the architecture of a mobile device, and which is downloaded, purchased, and upgraded through a central distribution portal (such as the App Store). One web
The idea that a website should be designed to work on multiple devices through CSS styles and HTML, without redesigning the site or changing the content for different devices.

Optimized content

Although the term "optimization" is often used for improving the visibility of a website in online search engines (also known as SEO), it sometimes refers to web content that's designed to function well on multiple computers and mobile devices.

QR code
Stands for "Quick Response" code. It's a barcode—read by devices such as camera phones— that enables someone to display certain information or open a web page. At this time, Android phones include native support for QR codes but iOS devices require a third-party app.

Responsive web design
A website that responds to the device that accesses it and delivers the appropriate output for it uses responsive design. Rather than designing multiple sites for different-sized devices, this approach designs one site but specifies how it should appear on varied devices.

Web app
Uses web browser technology on the Internet to display a mobile URL on a device, often with a different appearance than the corresponding desktop website.

Almost everything are using responsive web design in 2013