PredictionIO is an open source Machine Learning Server. It empowers programmers and data engineers to build smart applications. Machine Learning is about attempting to teach computers to predict future, or otherwise unknown events, by applying computer science or statistics techniques to analyze existing data. It can be seen as a transformation from existing data to improve insights about the unknown. PredictionIO is useful for any web and mobile apps. Here are some examples of smart features you can build with PredictionIO: predict user behaviors; offer personalized video, news, deals, ads and job openings; help users to discover interesting events, documents, apps and restaurants; provide impressive match-making services, etc.