Google Cloud Functions is a serverless computing service that allows developers to run code in response to events without managing servers. It automatically scales based on the workload, meaning you only pay for the compute time you use. This makes it ideal for tasks like processing data, responding to HTTP requests, or integrating with other Google Cloud services. With Google Cloud Functions, you can write functions in various programming languages, including JavaScript, Python, and Go. These functions can be triggered by events from sources like Cloud Storage, Pub/Sub, or HTTP requests, enabling seamless automation and integration within your applications.