This document discusses implementing real-time IoT stream processing using Azure Stream Analytics. It introduces the Lambda architecture pattern for processing real-time and batch data streams. Azure Stream Analytics is presented as a tool for real-time stream processing that can ingest data from sources like IoT Hub and Event Hubs and output to databases, services, and functions. The document demonstrates Stream Analytics queries, windowing functions, and integrating with Azure Machine Learning models. It also discusses running Stream Analytics on IoT Edge devices to analyze and filter data locally.