WSO2 BAM is a big data analytics and monitoring tool that provides scalable data collection, storage, and processing. It allows users to analyze large and varied data sources, create visualizations and reports, and gain insights. The document discusses how BAM addresses big data problems through its scalable architecture based on Hadoop, Cassandra, and other open source technologies. It also outlines the tool's data flow process and provides examples of out-of-the-box monitoring and analytics solutions it enables for various applications and platforms.