AppDrag Support Center
Introduction to responsive concepts
Responsive Web design is the approach that suggets that the design of a website should adapt automatically on every screen size. From desktop computer to mobile and tablet on portrait or landscape orientation the website should switch to accommodate to the available space on screen.
The same website on Desktop and on Smartphone version
On AppDrag every templates are responsive and the custom sections you will create might need just few adjustments to look great on all devices. Read this article Adjust margins/paddings for mobile to learn how to make these adjustments.
For more info check this w3schools.com article about Responsive Web Design.