Mobile usage is increasing dramatically, with people spending significant time and money on their mobile devices. Whether a mobile site or app is better depends on factors like a company's goals and customers' needs. Google offers solutions like AdWords, Play, and Analytics to help businesses reach users across platforms, devices, and stages of the consumer journey, and measure mobile marketing effectiveness through install attribution, in-app analytics, post-install optimization, and crash reporting. Proper measurement is important for mobile as tracking technology differs from the web.