The document discusses strategies for developing apps and mobile sites for the digital world. It notes that there are now over 4 billion mobile phones and 1 billion smartphones in use. By 2014, mobile internet usage will surpass desktop usage. The main mobile platforms are iOS and Android. The document outlines four main strategies for a mobile presence: mobile websites, responsive design, native apps, and cross-platform apps. Each option has advantages and disadvantages to consider depending on needs and goals.