Responsive Web Design
The responsive design approach says that a website should respond to the user's device, screen size, and orientation. As a result, websites created with the responsive design method are designed to display optimally at a range of sizes, no matter what device or screen resolution the user is using.
With responsive design, you only need one set of content for your site. As a result, you can save yourself the time and money you would otherwise spend creating entirely different sets of content for display on different devices.