This document provides a tutorial for building a basic miles to kilometers converter mobile app for Android. It outlines the steps needed to set up the Android SDK and Eclipse IDE, create an Android virtual device, start a new project, configure the launcher icon and activity, add views like text fields and buttons to the layout, set properties of the views, and implement the conversion logic in Java code. The goal is to take the user from starting a new project to having a working miles to km converter app built with a graphical user interface and basic calculation functionality.