The document discusses Uber and how it is one of the greatest innovations of Silicon Valley. It describes how Uber operates as a global ridesharing service using a smartphone app to arrange rides, with features like flexible pricing, no need to tip, and fast growth with over 300% annual growth rate. Uber's infrastructure allows users to get a ride anywhere within minutes and the company has seen over $1 billion in annual revenue from its top markets like New York City and San Francisco. The document contrasts Uber with the traditional taxi industry and other competitors like Lyft.