This document discusses web apps and progressive web apps. It begins with an introduction to Maria Clara Santana and her background. It then covers topics like the growth of mobile, differences between native and web apps, what UX design entails, and moves into discussing progressive web apps. It provides requirements for progressive web apps, examples of how to build them using technologies like Polymer, and tips for making them responsive, app-like, engageable, connectivity independent, and installable. It concludes with recommendations for further reading on progressive web apps.