AWS Greengrass extends AWS capabilities to edge devices, allowing them to act locally on generated data using local Lambda functions and message brokers while still connecting to the cloud. It enables devices to respond quickly to local events without relying on cloud connectivity, reducing costs for IoT applications through local processing and AWS-level security. The document provides an overview of AWS Greengrass and its benefits for industries including mining, manufacturing, and more. It demonstrates how Greengrass can process data at the edge through an example deployment at a mining site.