Thank you for putting your faith in Flutter in Action. This book is about making mobile apps for smart phones. Today, 'smart phones' are just called 'phones', and we hardly every use them to talk. In fact, its estimated that we spend almost 90% of time on mobile devices looking at apps. That's why Flutter is important. It's the first tool that lets us create applications with native -quality experiences for both major platforms at astonishing speed. We can leverage this tool to be the best mobile developers that we can be. When it comes to software, quality and speed of development are often at odds with other. Flutter challenges this fact of human nature though. Flutter uses a highly productive language and boasts sub-second hot reload in development mode. This means that you can slow down, breath, and write quality code and still produce apps at an amazing velocity.