The document provides an overview of rapid prototyping and hackdays at LinkedIn. It discusses what a hack is, the purpose of hackdays for technology exploration and learning new skills. It outlines an approach to rapid prototyping, including keeping things simple, selecting a purpose and technologies, having alternatives, and using available resources. Tips are given such as prioritizing quality, schedule or features. Design and mobile resources are listed, as well as frameworks and services for data visualization. The importance of shipping prototypes is emphasized with a Steve Jobs quote.