This document provides an introduction and overview of Piwik, an open source web analytics platform. It discusses Piwik's mission to create a leading international open source web analytics platform that gives users full control of their data. Some key facts about Piwik are that it is used by over 1% of websites worldwide, has over 1.1 million websites using it, and has been translated into 54 languages. The document highlights Piwik's core values including being an alternative to Google Analytics, having a decentralized open platform, security, reliability, freedom, and being engineered to last. It provides examples of how Piwik can be used to understand website audiences, traffic sources, and user behavior.