Responsive Web Design is the practice of developing a website that adapts to the size of a user's screen.

These days users can be viewing your website from hundreds of different screen sizes. Desktop monitors, laptop monitors, tablets, and mobile phones all come in tons of different shapes and sizes. If a website is well designed with responsive capabilities it will be able to morph and adjust to any screen size necessary.

Potential users don't want to explore a website that is confusing or difficult to read on their device.

Designing a website with responsive capabilities ensures that all users will have a good experience using your website no matter what kind of device they're using. Over 50% of web traffic today is through mobile devices. If your website only looks good and functions well on a computer screen you will potentially be alienating HALF of your user base.