Since its introduction, web designers and developers all over the world have rapidly adopted RWD. For us, RWD means designing an experience that holds up across multiple screen sizes. Responsive pattern libraries aid us in organizing large design systems that accommodate the smallest smartphone to the largest desktop monitor. As you can see, the library already has four sections: layouts, navigation, media, and forms and data.. All of these topics and their patterns will be covered in the following chapters. We will also be reviewing RWD best practices along the way. Hopefully, by the end of this book, you will feel inspired to start designing and developing your own patterns, while using a pattern library to hold them all.